Organic light-emitting element

Abstract

An organic light-emitting element characterized in that: a light-emitting layer contains a first compound and a second compound; the first compound has an emission lifetime of at least 500 [nsec] or has a difference between the lowest excited singlet energy and the lowest excited triplet energy of at most 0.25 [eV]; the second compound is a fluorescence material; and the organic light-emitting element satisfies expression [1].　[1] 8000≤(S1(A)-E(λmax))×ε, where S1(A) [eV] is the lowest excited singlet energy of the first compound, λmax [nm] is the absorption peak wavelength located most toward the longer wavelength side in the absorption spectrum of the second compound, E(λmax) [eV] is the energy corresponding to λmax, and ε [M-1·cm-1] is the molar absorption coefficient of the second compound at λmax [nm]

Description

Organic light-emitting diodes

[0001] This invention relates to an organic light-emitting element and an electronic device using the same.

[0002] An organic light-emitting element (also called an organic electroluminescent element or organic EL element) is an electronic element having a first electrode, a second electrode, and an organic compound layer placed between these electrodes. By injecting electrons and holes from this pair of electrodes, the holes and electrons recombine in the luminescent organic compound in the organic compound layer to generate excitons, and the organic light-emitting element emits light when these excitons return to the ground state. Recent advances in organic light-emitting elements have been remarkable, and their excellent characteristics, such as low driving voltage, diverse emission wavelengths, high responsiveness, and the ability to make light-emitting devices thinner and lighter, are expected to lead to their application in various electronic devices.

[0003] Currently, as an attempt to improve the luminescence efficiency and color purity of organic light-emitting devices, for example, TAF (TADF-assisted Fluorescence) type organic light-emitting devices are being developed, which combine thermally activated delayed fluorescence (TADF) materials with fluorescent light-emitting materials. TADF materials are luminescent organic compounds in which triplet excitons undergo reverse intersystem crossing to singlet excitons, and they function as so-called assist materials that support the luminescence of fluorescent light-emitting materials.

[0004] Patent Document 1 describes that a highly efficient organic light-emitting element can be obtained by ensuring that the emission wavelength on the short-wavelength side of the TADF material and the wavelength of the longest-wavelength peak top of the absorption spectrum of the fluorescent light-emitting material satisfy a predetermined relationship. Furthermore, Patent Document 2 describes that a highly efficient organic light-emitting element can be obtained by setting the molar extinction coefficient of the absorption spectrum of the fluorescent light-emitting material to 29,000 L / (mol·cm) or higher.

[0005] Japanese Patent Publication No. 2022-142304, International Publication No. 17 / 146192, Pamphlet

[0006] However, the organic light-emitting devices described in Patent Documents 1 and 2 had room for improvement in terms of color purity.

[0007] Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide an organic light-emitting device having excellent color purity.

[0008] One aspect of the organic light-emitting device according to the present disclosure is an organic light-emitting device having a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, wherein the organic compound layer has a light-emitting layer, the light-emitting layer has a first compound and a second compound different from the first compound, the emission lifetime of the first compound is 500 [nsec] or more, the second compound is a fluorescent material, and is characterized by satisfying the following formula [1]. 8000 ≦ (S ｍａｘ (A)−E(λ ｍａｘ ))×ε [1] S １ (A) [eV]: The lowest excited singlet state energy of the first compound λ ｍａｘ [nm]: The absorption peak wavelength located on the longest wavelength side among the absorption spectra of the second compound E(λ ｍａｘ 3]) [eV]: The energy corresponding to λ ｍａｘ ε [M －１ ・cm －１ : The molar absorption coefficient of the second compound at λ ｍａｘ [nm]

[0009] Another aspect of the organic light-emitting device according to the present disclosure is an organic light-emitting device having a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, wherein the organic compound layer has a light-emitting layer, the light-emitting layer has a first compound and a second compound different from the first compound, the first compound is a delayed fluorescence material, the difference between the lowest excited singlet state energy and the lowest excited triplet state energy is 0.25 [eV] or less, the second compound is a fluorescent material, and is characterized by satisfying the following formula [1]. 8000 ≦ (S １ (A)−E(λ ｍａｘ ))×ε [1] S １ (A) [eV]: The lowest excited singlet state energy of the first compound λ ｍａｘ [nm]: The absorption peak wavelength located on the longest wavelength side among the absorption spectra of the second compound E(λ ｍａｘ ) [eV]: The energy corresponding to λ ｍａｘThe corresponding energy ε[M] －１ ・cm －１ ]: λ of the second compound ｍａｘ Molar extinction coefficient in [nm] Further aspects of the organic light-emitting element according to this disclosure include a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, wherein the organic compound layer has a light-emitting layer, the light-emitting layer has a first compound and a second compound different from the first compound, the light-emitting lifetime of the first compound is 500 [nsec] or more, the second compound is a fluorescent light-emitting material, and the value of the following formula [A] is 3.0 × 10 １４ The above-mentioned organic light-emitting device.

[0010]

[0011] [In equation [A], J is the value of the overlap integral, and f Ａ (λ) is the emission spectrum of the first compound, ε Ｇ (λ) is the molar extinction coefficient of the second compound, and λ is the wavelength.

[0012] Further aspects of the organic light-emitting element according to the present disclosure include an organic light-emitting element comprising a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, wherein the organic compound layer has a light-emitting layer, the light-emitting layer comprises a first compound and a second compound different from the first compound, the first compound is a delayed fluorescence material having a difference of 0.25 [eV] or less between its lowest excited singlet energy and lowest excited triplet energy, and the second compound is a fluorescent light-emitting material having a value of 3.0 × 10⁻¹⁰ of the following formula [A]. １４ The above-mentioned organic light-emitting device.

[0013]

[0014] [In equation [A], J is the value of the overlap integral, and f Ａ (λ) is the emission spectrum of the first compound, ε Ｇ (λ) is the molar extinction coefficient of the second compound, and λ is the wavelength.

[0015] According to the embodiments of this disclosure, it is possible to provide an organic light-emitting element with excellent color purity.

[0016] This is a schematic cross-sectional view showing an example of a pixel in a display device according to one embodiment of the present disclosure. This is a schematic cross-sectional view of an example of a display device using an organic EL element according to one embodiment of the present disclosure. This is a schematic diagram showing an example of a display device according to one embodiment of the present disclosure. This is a schematic diagram showing an example of an imaging device according to one embodiment of the present disclosure. This is a schematic diagram showing an example of an electronic device according to one embodiment of the present disclosure. This is a schematic diagram showing an example of a display device according to one embodiment of the present disclosure. This is a schematic diagram showing an example of a foldable display device. This is a schematic diagram showing an example of an illumination device according to one embodiment of the present disclosure. This is a schematic diagram showing an example of an automobile having a vehicle light fixture according to one embodiment of the present disclosure. This is a schematic diagram showing an example of a wearable device according to one embodiment of the present disclosure. This is a schematic diagram showing an example of a wearable device according to one embodiment of the present disclosure, with an imaging device. This is a schematic diagram showing an example of an image forming apparatus according to one embodiment of the present disclosure. This is a schematic diagram showing an example of an exposure light source for an image forming apparatus according to one embodiment of the present disclosure. This is a schematic diagram showing an example of an exposure light source for an image forming apparatus according to one embodiment of the present disclosure. This is the emission spectrum of an organic light-emitting element according to Example 1. This is the emission spectrum of an organic light-emitting element according to Example 2. This is the emission spectrum of an organic light-emitting element according to Example 3. This is the emission spectrum of an organic light-emitting element according to Example 4. This is the emission spectrum of an organic light-emitting element according to Comparative Example 1. This is the emission spectrum of the organic light-emitting element according to Comparative Example 2. This is the emission spectrum of the organic light-emitting element according to Comparative Example 3. This is the emission spectrum of the organic light-emitting element according to Comparative Example 4.

[0017] In this specification, S １ (A) [eV] is the lowest singlet excitation energy of the first compound, S １ (G) [eV] is the lowest singlet excitation energy of the second compound. λ ｍａｘ [nm] is the wavelength of the absorption peak located on the longest wavelength side of the absorption spectrum of the second compound, where E (λ ｍａｘ ) [eV] is the λ ｍａｘ This is the energy equivalent to ε[M －１ ・cm －１] is the λ of the second compound. ｍａｘ This is the molar extinction coefficient at [nm].

[0018] In this specification, the lowest excitation singlet energy S １ This value is obtained by measuring the fluorescence emission spectrum of a thin film sample of each material (a single film if it is a host material, or a mixed film with the host material if it is not) and converting the wavelength at the short-wavelength end of the spectrum into energy. The fluorescence emission spectrum can be measured by irradiating the sample with excitation light at room temperature (25°C, 298K) and spectrally analyzing the light produced by photoexcitation with a spectrometer. Data acquisition is possible with, for example, a spectrofluorometer "F-4500" manufactured by Hitachi, Ltd., but is not limited to this. The wavelength (λ) at which the emission intensity on the short-wavelength side of the spectrum becomes 10% of the peak intensity of the fluorescence emission spectrum is used. Ｅｍｉｓｓｉｏｎ The lowest excitation singlet energy S is the value obtained by converting (assuming this is true) into energy. １ The following equation [a] was used as the conversion formula. Here, h represents Planck's constant and c represents the speed of light. １ = (h × c) / λ Ｅｍｉｓｓｉｏｎ = 1239.84 / λ Ｅｍｉｓｓｉｏｎ [a]

[0019] Furthermore, the lowest excited triplet energy T １ This value is obtained by measuring the phosphorescence emission spectrum and converting the wavelength at the short-wavelength end of the spectrum into energy. The phosphorescence emission spectrum can be measured by irradiating the sample with excitation light at a low temperature (-196°C, 77K) and spectrally separating the light generated by photoexcitation by wavelength using a spectrometer.

[0020] In this specification, the absorption spectrum of the second compound is given by 10 of the second compound. －５ A sample is prepared by placing an M-toluene solution in a quartz cell (optical path width 10 mm). This sample is then irradiated with light of a wavelength ranging from approximately 200 nm to 800 nm, while continuously changing the wavelength. The absorption of light (absorbance) at each wavelength can then be obtained and measured. In this case, the molar extinction coefficient ε is the absorbance divided by the solution concentration. Data acquisition is possible, for example, with a UV-3600 ultraviolet-visible-near-infrared spectrophotometer manufactured by Shimadzu Corporation, but this is not the only method that can be used.

[0021] <Organic Light-Emitting Device> The organic light-emitting device according to this embodiment will be described in detail below.

[0022] The organic light-emitting element according to this embodiment includes a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode. The organic compound layer has a light-emitting layer, and the light-emitting layer has a first compound and a second compound different from the first compound.

[0023] In this embodiment, the first compound is a compound having a luminescence lifetime of 500 [nsec] or more, or a material in which the difference between the lowest excited singlet energy and the lowest excited triplet energy is 0.25 [eV] or less.

[0024] Compounds having a luminescence lifetime of 500 [nsec] or more specifically include delayed fluorescence materials and phosphorescent materials. Phosphorescent materials may be organometallic complexes, and delayed fluorescence materials may be thermally activated delayed fluorescence materials. Among these, compounds having a luminescence lifetime of 500 [nsec] or more are preferably materials in which the difference between the lowest excited singlet energy and the lowest excited triplet energy is 0.25 [eV] or less.

[0025] As organometallic complexes, complexes containing heavy metal atoms such as iridium and platinum are preferred. Due to the heavy atom effect of these atoms, the transition from the triplet excited state to the ground state becomes an acceptable transition, and the triplet exciton is converted to the singlet state of the second compound by Förster transfer. As a result, fluorescence emission is also produced by radiative deactivation, thus achieving the effects of the present invention. At this time, the lowest excited triplet energy (S) of the first compound is １ (A)) is the lowest excitation singlet energy (S) of the second compound. １ A value greater than (G) is preferable because it makes Förster movement more likely.

[0026] Here, luminescence lifetime refers to the decay time of luminescence. Specifically, it is the time it takes for the luminescence brightness to decrease from 1.0 to 0.5. More preferably, it is the time it takes for the luminescence brightness to decrease from 1.0 to 1 / e, or to 1 / 10. Here, e is Napier's number.

[0027] Furthermore, "delayed fluorescence materials" have the lowest excitation singlet energy (S １ ) and the lowest excited triplet energy (T １ Compounds with a difference of 0.25 [eV] or less are preferred, more preferably 0.20 [eV] or less, more preferably 0.15 [eV] or less, and most preferably 0.10 [eV] or less. A small value in this regard makes it easier for reverse intersystem crossing of excitons to occur, allowing triplet excitons to contribute to luminescence, thus making it easier to obtain the effects of the present invention.

[0028] The features of the organic light-emitting element according to this embodiment will be described in detail below.

[0029] (1) Relationship between the first compound and the second compound In the organic light-emitting device according to this embodiment, the first compound and the second compound in the light-emitting layer satisfy the relationship of the following formula [1]. Note that (S １ (A) - E(λ) ｍａｘ )) × ε can also be described as the overlap integral of the emission spectrum of the first compound and the absorption spectrum of the second compound. 8000 ≤ (S １ (A) - E(λ) ｍａｘ )) × ε [1] S １ (A) [eV]: Lowest excited singlet energy λ of the first compound ｍａｘ [nm]: The absorption peak wavelength E (λ) of the absorption spectrum of the second compound, which is located at the longest wavelength end. ｍａｘ ) [eV]: λ ｍａｘ The corresponding energy ε[M] －１ ・cm －１ ]: λ of the second compound ｍａｘ Molar extinction coefficient at [nm]

[0030] The organic light-emitting element according to this embodiment can exhibit excellent color purity by satisfying the relationship in formula [1]. The reason for this is explained below.

[0031] When electrons and holes are injected into the light-emitting layer, the recombination of these electrons and holes generates singlet excitons and triplet excitons in each compound with a probability of 1:3. Subsequently, the energy of the singlet excited state generated in the first compound is transferred to the singlet excited state of the second compound via a Förster transfer, and the exciton is deactivated by radiation, allowing the organic light-emitting device to emit the desired color.

[0032] At this time, the light emitted from the light-emitting layer may include light emitted not only from the second compound but also from the first compound. Therefore, in the region where the second compound can absorb the light emitted by the first compound, it is thought that the second compound can absorb the light emitted from the first compound if the product of the energy difference in that region and the molar extinction coefficient of the second compound is large.

[0033] Generally, the color purity of the light emitted by the first compound tends to be lower than that of the second compound. Therefore, by having the second compound absorb the light emitted by the first compound, the color purity of the light emitted from the light-emitting layer can be improved.

[0034] For the reasons stated above, the organic light-emitting element according to this embodiment can exhibit excellent color purity. At this time, (S １ (A) - E(λ) ｍａｘ The value of )) × ε is 8000 or greater.

[0035] Furthermore, Förster energy transfer is a phenomenon in which excitation energy is transferred between two adjacent molecules due to dipole-dipole interaction. In order to efficiently transfer Förster energy from the first compound (TADF, assist material) to the second compound (dopant, guest material), it is preferable that the second compound can absorb energy in the energy (emission wavelength) band of the excitons generated by the first compound.

[0036] Equation [A] is known to represent the relationship between the first compound and the second compound. A larger value of equation [A] indicates a greater overlap between the emission spectrum of the first compound and the absorption spectrum of the second compound.

[0037]

[0038] In equation [A], J is the value of the overlap integral, and f Ａ (λ) is the emission spectrum of the first compound, ε Ｇ (λ) is the molar extinction coefficient of the second compound, and λ is the wavelength. Here, the emission spectrum of the first compound is the value after area normalization of the obtained emission spectrum. Here, area normalization means that the value is normalized so that the area of ​​the emission spectrum is 1.

[0039] In this embodiment, the organic light-emitting element is defined in formula [A] as having J = 3.0 × 10 １４ Preferably, it is 5.0 × 10 １４ It is even more preferable that the above is true. Also, J is 1.0 × 10 １５ The following may be true: 8.0 × 10 １４ The following may be used: 7.5 × 10 １４ The following is acceptable. Also, J is 3.0 × 10 １４ The above 1.0 x 10 １５ The following may be true: 3.0 × 10 １４ The above 8.0 x 10 １４ The following may be true: 3.0 × 10 １４ The above 7.5 x 10 １４ The following is acceptable:

[0040] In the above formula [A], J is 3.0 × 10 １４ As described above, in an organic light-emitting device in which the first compound has a luminescence lifetime of 500 [nsec] or more and the second compound is a fluorescent light-emitting material, excellent color purity can be obtained.

[0041] Furthermore, in the above formula [A], J is 3.0 × 10 １４ The above is true, and the first compound has the lowest excitation singlet energy (S １ ) and the lowest excited triplet energy (T １ The compound has a difference of 0.25 [eV] or less, and in an organic light-emitting device in which the second compound is a fluorescent material, excellent color purity can be obtained.

[0042] Further, the first compound and the second compound preferably satisfy the following formula [1-1], more preferably satisfy the following formula [1-2], and desirably satisfy the following formula [1-3]. Compared with formula [1], formulas [1-1] to [1-3] indicate that the region where the second compound can absorb the light emitted by the first compound has become wider, or the molar absorption coefficient of the second compound has increased. Therefore, an organic light-emitting device that satisfies formulas [1-1] to [1-3] is an organic light-emitting device with better color purity. 8500 ≦ (S １ (A) - E(λ ｍａｘ )) × ε [1-1] 8632 ≦ (S １ (A) - E(λ ｍａｘ )) × ε [1-2] 9000 ≦ (S １ (A) - E(λ ｍａｘ )) × ε [1-3]

[0043] Further, by the first compound and the second compound satisfying at least one of the following formulas [2] to [6], an organic light-emitting device excellent in device durability can be obtained, which is preferable. In the present embodiment, it is more preferable to satisfy at least formula [2], and in addition to formula [2], it is more preferable to satisfy any one of formulas [3] to [6], and it is particularly preferable to satisfy all of formulas (2) to (6). 8000 ≦ (S １ (A) - E(λ ｍａｘ )) × ε ≦ 30000 [2] 0.1 [eV] ≦ S １ (A) - E(λ ｍａｘ ) [3] S １ (A) - E(λ​​​​​​​​​​​​​​A material with high (A)) is required. When high energy is required to form a singlet excited state, generally, adverse effects such as easy decomposition of the material tend to occur in the process of repeatedly exciting the excited state and the ground state, which is likely to lead to a decrease in the durability of the organic light-emitting device. By satisfying at least any one of the formulas [2] to [6], the organic light-emitting device according to the present embodiment can provide an organic light-emitting device excellent in color purity and device durability.

[0045] Also, (S １ (A) - E(λ ｍａｘ )) × ε is preferably 30,000 or less, more preferably 27,500 or less, and desirably 26,446 or less.

[0046] Also, ε is within the ranges of formulas [5] and [6], preferably 40,000 [M [[ID=十一]] －１ ·cm －１ or more and 100,000 [M －１ ·cm －１ or less, more preferably 45,000 [M －１ ·cm －１ or more and 90,000 [M －１ ·cm －１ or less, and even more preferably 47,500 [M －１ ·cm －１ or more and 87,287 [M －１ ·cm －１ or less.

[0047] Also, from another perspective, in the organic light-emitting device according to the present embodiment, among the emission peaks of the first compound, the wavelength of the emission peak showing the highest emission intensity is preferably longer than the wavelength of the emission peak showing the highest emission intensity among the emission peaks of the second compound. As a result, the emission energy of the first compound is reduced as a whole, so that the stability of the material can be enhanced, and excellent device durability can be exhibited.

[0048] In the light-emitting layer, it is more preferable that the mass ratio of the first compound is greater than the mass ratio of the second compound. Furthermore, in the light-emitting layer, it is preferable that the content of the second compound is 0.5% by mass or more when the entire light-emitting layer is considered to be 100% by mass. It is also preferable that the content of the second compound is 10% by mass or less. By dispersing the second compound in the light-emitting layer, aggregation can be prevented, concentration quenching and shifts in the emission spectrum can be suppressed, and a highly efficient element with high color purity can be realized.

[0049] In this embodiment, the light-emitting layer may have a third compound. In this case, the third compound is called a host material that plays a role in transporting electrons or holes within the light-emitting layer. Preferably, the third compound has the largest mass ratio among the compounds constituting the light-emitting layer, and in order to efficiently transfer the exciton energy generated in the third compound to the second compound, the lowest excitation singlet energy (S) of the third compound is preferably large. １ (H)) is the lowest excitation singlet energy (S) of the first compound. １ It is desirable that it be higher than (A).

[0050] Furthermore, in this embodiment, the lowest excitation singlet energy S of the first compound １ (A) is the lowest excitation singlet energy S of the second compound. １ (G) is preferable. Satisfying this relationship makes it easier for the generated excitons to transfer energy from the first compound to the second compound. As a result, the luminescence originating from the first compound can be further reduced, thus improving color purity.

[0051] In the following, we will specifically describe the compounds that can be used as the first, second, and third compounds.

[0052] In this specification, halogen atoms include, but are not limited to, fluorine, chlorine, bromine, iodine, astatine, and tennessine.

[0053] The alkyl group may be an alkyl group having 1 to 20 carbon atoms, or an alkyl group having 1 to 10 carbon atoms. Specifically, examples include, but are not limited to, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, t-butyl group, s-butyl group, octyl group, cyclohexyl group, t-pentyl group, 3-methylpentan-3-yl group, 1-adamantyl group, and 2-adamantyl group.

[0054] The alkoxy group may be an alkoxy group having 1 to 20 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms. Specifically, examples include, but are not limited to, a methoxy group, an ethoxy group, a propoxy group, an isopropyl group, a t-butoxy group, a 2-ethyloctyloxy group, a benzyloxy group, etc.

[0055] Examples of silyl groups include, but are not limited to, trimethylsilyl and triphenylsilyl groups.

[0056] The aryl group may have 6 to 20 carbon atoms, 6 to 18 carbon atoms, or 6 to 12 carbon atoms. Specifically, examples include, but are not limited to, phenyl, biphenyl, naphthyl, phenanthrenyl, triphenylenyl, indenyl, terphenyl, fluorenyl, pyrenyl, anthracenyl, perilenyl, chrysenyl, and fluoranthenyl groups.

[0057] The heterocyclic group may have 3 to 24 carbon atoms, 3 to 18 carbon atoms, or 3 to 12 carbon atoms. Specifically, examples include, but are not limited to, pyridyl, pyrimidyl, pyrazyl, triazyl, benzofuranyl, benzothiophenyl, dibenzofuranyl, dibenzothiophenyl, oxazolyl, oxadiazolyl, thiazolyl, thiadiazolyl, carbazolyl, acridinyl, phenanthrolyl, and indazole groups.

[0058] The amino group may be a substituted amino group substituted with an alkyl group or an aryl group, and may be a substituted amino group substituted with an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms. Specifically, examples include, but are not limited to, N-methylamino group, N-ethylamino group, N,N-dimethylamino group, N,N-diethylamino group, N-methyl-N-ethylamino group, N-benzylamino group, N-methyl-N-benzylamino group, N,N-dibenzyloamino group, anilino group, N,N-diphenylamino group, N,N-dinaphthylamino group, N,N-difluorenylamino group, N-phenyl-N-tolylamino group, N,N-ditolylamino group, N-methyl-N-phenylamino group, N,N-dianisorylamino group, N-mesityl-N-phenylamino group, N,N-dimesitylamino group, N-phenyl-N-(4-t-butylphenyl)amino group, N-phenyl-N-(4-trifluoromethylphenyl)amino group, N-piperidyl group, etc.

[0059] Examples of aryloxy groups include, but are not limited to, phenoxy groups.

[0060] Examples of heteroaryloxy groups include, but are not limited to, thienyloxy groups.

[0061] Examples of substituents that the alkyl groups, alkoxy groups, amino groups, aryloxy groups, silyl groups, aryl groups, heterocyclic groups, and heteroaryloxy groups may further have include, but are not limited to, deuterium, alkyl groups such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, and t-butyl group, aralkyl groups such as benzyl group, aryl groups such as phenyl group and biphenyl group, heterocyclic groups such as pyridyl group and pyrrolyl group, amino groups such as dimethylamino group, diethylamino group, dibenzylamino group, diphenylamino group, and ditolylamino group, alkoxy groups such as methoxy group, ethoxy group, and propoxy group, aryloxy groups such as phenoxy group, halogen atoms such as fluorine, chlorine, bromine, and iodine, and cyano groups.

[0062] [First Compound] The first compound preferably has a wavelength half-width of 90 nm or less for the emission peak that shows the highest emission intensity among the emission peaks. A narrow half-width allows for a certain color purity to be maintained even if the light emitted by the first compound is emitted from an organic light-emitting device.

[0063] An example of a compound that can be used in the first compound is the compound represented by the following general formula (1).

[0064]

[0065] In the above general formula (1), R １１ ~R １８ R is independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. Each substituent may be the same or different, and adjacent substituents may bond to each other to form a ring. Here, R １１ ~R １８ In this case, adjacent substituents are R １１ and R １２ , R １２ and R １３ , R １３ and R １４ , R １５ and R １６ , R １６ and R １７ , R １７ and R １８ It refers to.

[0066] R １１ ~R １８ Preferred members include hydrogen atoms, unsubstituted or phenyl-substituted carbazole groups, and unsubstituted or alkyl-substituted phenyl groups. If a ring is formed, it is preferable to form an aromatic hydrocarbon ring or a heteroaromatic ring. In particular, a fluorene ring or a benzochalcogenofen ring is preferred, and benzofuran rings, benzothiophene rings, indazole rings, and unsubstituted or alkyl-substituted indan rings are preferred.

[0067] n is an integer between 1 and 5, and m is an integer between 1 and 3.

[0068] EWG represents an electron-withdrawing substituent. The electron-withdrawing group may be an alkyl fluoride group, a cyano group, or a substituent consisting of a heterocycle containing a nitrogen atom. Specifically, examples include substituents including pyridine, pyrimidine, pyridazine, triazine, pyrazole, imidazole, trifluoromethyl group, or cyano group, with triazine groups being preferred if they are unsubstituted or substituted with alkyl-substituted phenyl groups.

[0069] R ２１ The group is independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. Specifically, alkyl groups, phenyl groups substituted with alkyl groups or phenyl groups, and cyano groups are preferred.

[0070] l is an integer from 0 to 4. m + n + l may be an integer between 2 and 6, preferably between 2 and 5, and more preferably between 2 and 4. Multiple R ２１ The members may be the same or different.

[0071] The compound relating to the above general formula (1) is preferably a compound represented by the following general formula (1a).

[0072]

[0073] In the above general formula (1a), R １１ ~R １８ R in general formula (1) １１ ~R １８ It is the same as this.

[0074] R ２１ , R ３１ and R ３２R is independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. Specifically, R ２１ Preferred examples include alkyl groups, substituted or alkyl or phenyl groups, and cyano groups. ３１ and R ３２ Preferred examples include substituted or alkyl-substituted phenyl groups.

[0075] Here, l is an integer from 0 to 4, m is an integer from 1 or 2, and n is an integer from 1 to 5. m + n + l may be an integer between 2 and 6, preferably between 2 and 5, and more preferably between 2 and 4.

[0076] Multiple R ２１ The members may be the same or different.

[0077] Furthermore, the compound relating to general formula (1) is preferably a compound represented by either of the following general formulas (1b-1) or (1b-1).

[0078]

[0079] In the above general formulas (1b-1) and (1b-2), R １１ ~R １３ R in general formula (1) １１ ~R １８ It is the same as this.

[0080] R ２１ , R ３１ and R ３２ R is independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. ２１ Preferably, at least one substituent is a substituted or unsubstituted alkyl group, or a substituted or unsubstituted alkoxy group. ３１ and R ３２A phenyl group substituted with a substituted or alkyl group is preferred. n is an integer from 0 to 2, n' and n'' are integers from 0 to 4. l is an integer from 1 to 4, and m and m' are integers from 0 to 5. m + n + l may be an integer from 2 to 6, preferably from 2 to 5, and more preferably from 2 to 4.

[0081] The substituents mentioned above may be the same or different from each other.

[0082] X is an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom, NR, or CRR'. R and R' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups. Oxygen atoms and sulfur atoms are preferred as X.

[0083] Furthermore, it is preferable that the compound relating to general formula (1) is a compound represented by the following general formula (1c).

[0084]

[0085] In the above general formula (1c), R １１ ~R １８ R in general formula (1) １１ ~R １８ It is the same as this.

[0086] R ２１ Each of these is independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group.

[0087] Here, l is an integer from 0 to 4, m is an integer from 1 to 3, and n is an integer from 1 to 5. m + n + l may be an integer between 2 and 6, preferably between 2 and 5. Multiple R ２１The elements may be the same or different. ２１ Preferred examples include phenyl groups, fluorine atoms, and cyano groups.

[0088] Examples of representative compounds represented by general formula (1), general formula (1a), general formula (1b-1), general formula (1b-2), and general formula (1c) include, but are not limited to, the following.

[0089]

[0090]

[0091]

[0092]

[0093]

[0094]

[0095]

[0096]

[0097]

[0098]

[0099]

[0100]

[0101]

[0102] Furthermore, the first compound is preferably a compound represented by either of the following general formulas (2) or (3).

[0103]

[0104] In the above general formulas (2) and (3), M １ and M ２ This represents a transition metal. Specifically, M １ Platinum (Pt), palladium (Pd), M ２ Iridium (Ir) is a preferred example.

[0105] M１ and M ２ X that combines with １１ ~X １４ , X ２１ , X ２２ This is independently selected from either a nitrogen atom or a carbon atom.

[0106] Cy １ ~Cy ５ These are ring structures consisting of carbon atoms and hydrogen atoms, with 5 to 20 carbon atoms, or heterocyclic structures containing heteroatoms, with 2 to 19 carbon atoms. Specifically, examples include benzene rings, pyridine rings, benzimidazole rings, carbazole rings, dibenzofuran rings, and indazole rings.

[0107] R １１ ~R １４ , R ３１ Each of these substituents represents an atom forming a ring, and is independently selected from the group consisting of deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups, and may be bonded to each other by adjacent substituents to form a ring. The ring may be an aromatic hydrocarbon ring or a heteroaromatic ring.

[0108] Here, adjacent substituents refer to substituents bonded to adjacent carbon atoms.

[0109] R １１ ~R １４ Preferably, R includes alkyl groups, unsubstituted or alkyl-substituted phenyl groups, and carbazole groups. ３１ Preferred examples include alkyl groups, unsubstituted or alkyl-substituted phenyl groups.

[0110] Furthermore, l and n are integers from 0 to 12, m and o are integers from 0 to 11, and o' is an integer from 0 to 12.

[0111] In general formula (2), L １１ ~L １３These are single bonds, double bonds, oxygen atoms, sulfur atoms, selenium atoms, tellurium atoms, *-CR=*, *-CO-*, *-CRR'-*, *-CR=C-*, *=CR-*, *-C≡C-*, *-NR-*, *-BR-*, *-CS-*, *-PR-*, *-SO-*, *-SO ２ Each is independently selected from the groups consisting of -* and *-SiRR'-*. * is Cy １ and Cy ２ Cy ２ and Cy ４ Cy ３ and Cy ４ This represents the bond position to the Cy ring in each of the following: R and R' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups. １１ , L １３ As for the bond, a single bond is preferred, L １２ Preferred examples include single bonds and oxygen atoms.

[0112] In general formula (3), L ２１ , L ２２ Each of these represents a different ligand. m' and n' are integers from 0 to 2, and l' is an integer from 1 to 3, such that m' + n' + l' = 2 or 3.

[0113] R ２１ ~R ２４ R may be independently selected from the group consisting of hydrogen atoms, deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups, and adjacent substituents may be bonded to each other to form a ring. The ring may be an aromatic hydrocarbon ring or a heteroaromatic ring. Here, R ２１ ~R ２４ In this case, adjacent substituents are R ２１and R ２２ , R ２２ and R ２３ , R ２３ and R ２４ This refers to R. ２１ ~R ２４ Preferred examples include alkyl groups, fluorine atoms, and cyano groups.

[0114] M ２ (L ２１ )n' is given by the following general formula (3-1) or (3-2), M ２ (L ２２ )m' is represented by the following general formula (3-3), and each is chosen independently.

[0115]

[0116] In general formulas (3-1) to (3-3), R ４１ ~R ４４ , R ５１ ~R ５３ Each of these is independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted silyl group, and a cyano group. ４１ ~R ４４ , R ５１ ~R ５３ Preferably, alkyl groups are mentioned.

[0117] Cy ６ This is a ring structure with 5 to 10 carbon atoms, or a heterocyclic structure with 4 to 9 carbon atoms containing a heteroatom. ６ A tetrazole ring is a preferred example.

[0118] R ４５ Cy ６This represents a substituent on the atom forming the compound, and is independently selected from the group consisting of deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups. p' is R ４５ It represents a number and is an integer from 0 to 6.

[0119] Examples of representative compounds represented by general formula (2) or general formula (3) include, but are not limited to, the following compounds.

[0120]

[0121]

[0122] [Second Compound] The second compound in this work plays the role of a guest material that ultimately emits light, and is preferably a material that can emit fluorescence. Here, fluorescence emission refers to the phenomenon in which the energy released when returning from a singlet excited state to the ground state is emitted as light. It may also be a material that, like a thermally activated delayed fluorescence material, goes from a triplet excited state to a singlet excited state through reverse intersystem crossing, and emits the energy released when returning from the singlet excited state to the ground state as light.

[0123] The second compound is preferably a blue light-emitting material. Specifically, it is preferable that the wavelength of the emission peak showing the highest emission intensity among the emission peaks is between 440 nm and 480 nm. This is because the Förster migration speed tends to slow down at high energy states. Therefore, an organic light-emitting element capable of emitting blue light satisfies the relationship in formula [1] above. Furthermore, from the viewpoint of obtaining blue light emission with excellent color purity, it is preferable that the full width at half maximum of the emission peak of the second compound is 30 nm or less.

[0124] An example of a compound that can be used as the second compound is the compound represented by the following general formula (4).

[0125]

[0126] In the above general formula (4), Cy １ ~Cy ３ The ring structure is a ring structure having 5 to 13 carbon atoms, or a heterocyclic structure having 4 to 12 carbon atoms containing a heteroatom. Specifically, preferred examples include a benzene ring, indene ring, naphthothiophene ring, benzothiophene ring, benzofuran ring, benzoselenophene ring, dibenzothiophene ring, dibenzofuran ring, dibenzoselenophene ring, and indazole ring. More preferably, the ring is a benzene ring, indene ring, benzothiophene ring, or benzofuran ring.

[0127] R １１ and R １２ , R １４ These are Cy １ ~Cy ３ This represents a substituent on a carbon atom or heteroatom, and is independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. Specifically, alkyl groups, unsubstituted or alkyl-substituted phenyl groups, unsubstituted or alkyl or phenyl groups, carbazole groups, carbazole groups substituted with carbazole groups, and alkyl-substituted acridinyl groups are preferred. The alkyl group may have 1 to 6 carbon atoms, or 1 to 4 carbon atoms.

[0128] l, m, and n are substituents R, respectively. １１ and R １２ , R １４The numbers represent the number of atoms, where l and m are integers from 0 to 8, and n is an integer from 0 to 7. X is a boron atom or a nitrogen atom. Y and Z are oxygen atoms, sulfur atoms, selenium atoms, tellurium atoms, BR, and NR. Here, R is independently selected from the group consisting of hydrogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups. Alternatively, R may be independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups.

[0129] Furthermore, at least one of X, Y, and Z is a boron atom or BR, and if X is a boron atom, Y and Z are not BR, and if X is not a boron atom, Y and Z may be BR.

[0130] R １１ and R １２ , R １１ and R, R １２ and R, R １４ R and R may form a ring with each other. When a ring is formed, it may contain carbon atoms or heteroatoms, and an aromatic hydrocarbon ring or a heteroaromatic ring is preferred. The heteroatom may be a nitrogen atom, an oxygen atom, a sulfur atom, or a selenium atom.

[0131] Furthermore, it is also preferable that the compound used for the second compound is a compound represented by either of the following general formulas (4a-1) or (4a-2).

[0132]

[0133] In the above general formulas (4a-1) and (4a-2), Cy １ ~Cy ５This is a ring structure having 5 to 13 carbon atoms or a heterocyclic structure having 4 to 12 carbon atoms containing a heteroatom. Specifically, preferred examples include a benzene ring, indene ring, naphthothiophene ring, benzothiophene ring, benzofuran ring, benzoselenophene ring, dibenzothiophene ring, dibenzofuran ring, dibenzoselenophene ring, and indazole ring. More preferably, it is a benzene ring, indene ring, benzothiophene ring, or benzofuran ring.

[0134] R １１ ~R １５ These are Cy １ ~Cy ５ The substituents on the carbon atom or heteroatom are independently selected from the group consisting of deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups, and adjacent substituents may bond to each other to form a ring. If a ring is formed, the ring may be an aromatic hydrocarbon ring or a heteroaromatic ring and may contain carbon atoms or heteroatoms. The heteroatom may be a nitrogen atom, oxygen atom, sulfur atom, or selenium atom. Specifically, alkyl groups, diphenylamino groups, unsubstituted or alkyl-substituted phenyl groups, and unsubstituted or alkyl-substituted carbazole groups are preferred. The alkyl group may have 1 to 6 carbon atoms, or 1 to 4 carbon atoms.

[0135] Here, adjacent substituents refer to substituents bonded to adjacent carbon atoms.

[0136] l and l' are substituents R, respectively. １１ and R １２ The number of substituents R is represented, and m and m' are substituents R, respectively. １３ and R １５ This represents the number of substituents R, where n is the substituent R. １４This represents the number of [something]. In general formula (4a-1), l and l', m and m' are from 0 to 8, and n is an integer from 0 to 2. In general formula (4a-2), l and l' are from 0 to 8, and m and m', and n are integers from 0 to 6.

[0137] R in general formula (4a-1) １１ and R １２ , R １２ and R １３ , R １５ and R １１ The substituents may bond to each other to form a ring, and in general formula (4a-2), R １１ and R １４ , R １２ and R １４ The substituents may bond to each other to form a ring. If a ring is formed, the ring may be an aromatic hydrocarbon ring or a heteroaromatic ring, and may contain carbon atoms or heteroatoms. The heteroatoms may be nitrogen atoms, oxygen atoms, sulfur atoms, or selenium atoms. X is a nitrogen atom. １ and X ２ , Y １ and Y ２ The atoms are an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom, NR, and SiRR''. Here, R and R'' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups.

[0138] X １ and X ２ , Y １ and Y ２ These elements may be the same or different from each other. Specifically, oxygen atoms, sulfur atoms, NR, and selenium atoms are preferred. For NR, R is preferably an alkyl group, an unsubstituted or alkyl-substituted phenyl group. The alkyl group may have 1 to 6 carbon atoms, or 1 to 4 carbon atoms.

[0139] Furthermore, the compound used for the second compound is preferably a compound represented by the following general formula (4a-3).

[0140]

[0141] In the above general formula (4a-3), R １１ ~R １４ , R ２１ and R ２４ , R ３１ Each substituent is independently selected from the group consisting of hydrogen atoms, deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups, and adjacent substituents may bond to each other to form a ring. If a ring is formed, the ring may be an aromatic hydrocarbon ring or a heteroaromatic ring, and may contain carbon atoms or heteroatoms. The heteroatoms may be nitrogen atoms, oxygen atoms, sulfur atoms, or selenium atoms. Specifically, alkyl groups, diphenylamino groups, and unsubstituted or alkyl-substituted phenyl groups are preferred. The alkyl group may have 1 to 6 carbon atoms, or 1 to 4 carbon atoms.

[0142] Here, adjacent substituents are R １１ and R １２ , R １２ and R １３ , R １３ and R １４ , R ２１ and R ２２ , R ２２ and R ２３ , R ２３ and R ２４ , R １１ and R ２４ It refers to.

[0143] Y １ and Y ２Here, R and R' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups. １ and Y ２ These elements may be the same or different from each other. Specifically, oxygen atoms, sulfur atoms, amino groups, and especially phenylamino groups are preferred.

[0144] Cy １ and Cy ２ This is represented by the following general formula (4a-3') or general formula (4a-3'').

[0145]

[0146] In the above general formulas (4a-3') and (4a-3''), * represents the bonding position with * in general formula (4a-3), and the boron atom and Y are respectively １ and Y ２ It combines with it to form a ring.

[0147] X １ and X ２ R and R'' are independently selected from the group of chalcogen atoms consisting of oxygen, sulfur, selenium, tellurium, NR, SiRR'', and CR''. R and R'' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heteroaryl groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups.

[0148] R ４１ ~R ４４ , R ５１ ~R ５４R is independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted silyl group, and a cyano group, and adjacent substituents may be bonded to each other to form a ring. Here, R ４１ ~R ４４ In this case, adjacent substituents are R ４１ and R ４２ , R ４２ and R ４３ , R ４３ and R ４４ This refers to R. ５１ ~R ５４ The same applies to R. When a ring is formed, the ring may be an aromatic hydrocarbon ring or a heteroaromatic ring, and may contain carbon atoms or heteroatoms. The heteroatoms may be nitrogen atoms, oxygen atoms, sulfur atoms, or selenium atoms. ４１ ~R ４４ , R ５１ and R ５４ Specifically, alkyl groups, aryl groups, particularly phenyl groups, amino groups, and particularly diphenylamino groups are preferred. The alkyl group may have 1 to 6 carbon atoms, or 1 to 4 carbon atoms.

[0149] Examples of representative compounds represented by general formula (4), general formula (4a-1), general formula (4a-2), and general formula (4a-3) include, but are not limited to, the following compounds.

[0150]

[0151]

[0152]

[0153]

[0154]

[0155]

[0156]

[0157]

[0158]

[0159]

[0160]

[0161]

[0162] Furthermore, it is also preferable that the compound used for the second compound is a compound represented by the following general formula (5-1) or (5-2).

[0163]

[0164] In general formulas (5-1) and (5-2), Cy ４ This is a ring structure having 5 to 13 carbon atoms, or a heterocyclic structure having 4 to 12 carbon atoms including a heteroatom. Specifically, benzene rings and naphthalene rings are preferred examples.

[0165] R １１ ~R ２７ R is independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted silyl group, and a cyano group, and adjacent substituents may be bonded to each other to form a ring. Here, R １１ ~R １７ In this case, adjacent substituents are R １１ and R １２ , R １２ and R １３ , R １４ and R １５ , R １５ and R １６ , R １６ and R １７ This refers to R. ２１ ~R ２７The same applies to R. When a ring is formed, the ring may be an aromatic hydrocarbon ring or a heteroaromatic ring, and may contain carbon atoms or heteroatoms. The heteroatoms may be nitrogen atoms, oxygen atoms, sulfur atoms, or selenium atoms. １１ ~R ２７ Specifically, preferred examples include alkyl groups, phenyl groups, alkyl-substituted phenyl groups, amino groups, diphenylamino groups, triazine groups, and diphenyltriazine groups. The alkyl group may have 1 to 6 carbon atoms, or 1 to 4 carbon atoms. Also, R １１ ~R ２７ If the ring structure is formed, it is preferably a benzochalcogenphene ring, and particularly preferably a benzofuran ring.

[0166] X' and Y' are an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom, NR, SiRR', or CRR'. Here, R and R' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups. Specifically, oxygen atoms, sulfur atoms, and selenium atoms are preferred.

[0167] R ３１ is Cy ４ The substituents are independently selected from the group consisting of a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted silyl group, and a cyano group. n is R ３１ This represents the number of atoms and is an integer from 0 to 6. Specifically, alkyl groups, or phenyl groups substituted with alkyl groups, cyano groups, fluorine atoms, or methyl fluoride groups are preferred.

[0168] Examples of representative compounds represented by general formulas (5-1) and (5-2) include, but are not limited to, the following:

[0169]

[0170]

[0171]

[0172]

[0173]

[0174]

[0175]

[0176]

[0177] (4) Third compound An example of a compound that can be used as the third compound is the compound represented by the following general formula (6).

[0178]

[0179] In the above general formula (6), R １１ ~R １８ Each of these substituents may be independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted silyl group, and a cyano group, and adjacent substituents may be bonded to each other to form a ring. １１ ~R １８ Specifically, examples include alkyl groups and substituted or unsubstituted phenyl groups.

[0180] Here, R １１ ~R １８ In this case, adjacent substituents are R １１ and R １２ , R １２ and R １３ , R １３ and R １４ , R１５ and R １６ , R １６ and R １７ , R １７ and R １８ This refers to a ring. Furthermore, the ring may be an aromatic hydrocarbon ring or a heteroaromatic ring.

[0181] Cy Ａ This is a ring structure with 6 to 13 carbon atoms, or a heterocyclic structure with 5 to 12 carbon atoms containing a heteroatom. Ａ Specifically, preferred examples include benzene rings, pyridine rings, biphenyl rings, terphenyl rings, triazine rings, carbazole rings, and indazole rings.

[0182] n is Cy Ａ R represents the number of rings and is an integer between 1 and 5. ａ Cy Ａ The substituents on the ring-forming atoms are independently selected from the group consisting of deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups.

[0183] n' is substituent R ａ R represents a number, and is an integer from 1 to 9. １１ ~R １８ , and R ａ At least one of them has the structure of the following general formulas (6a) to (6d).

[0184]

[0185] In the above general formulas (6a) to (6d), X １ ~X ３ , Y １ Y ４ These are carbon atoms or nitrogen atoms, which may be the same or different from each other.

[0186] Z １ It is one of the following atoms: nitrogen, oxygen, sulfur, selenium, or tellurium.

[0187] R ２１ ~R ２５ , R ３１ ~R ３６ , R ４１ and R ４２ , R ５１ ~R ５３ R represents substituents on the atoms forming each ring structure, and is independently selected from the group consisting of deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups, and adjacent substituents may bond to each other to form a ring. Here, adjacent substituents are R ２１ and R ２２ , R ２２ and R ２３ , R ２３ and R ２４ , R ２４ and R ２５ , R ３１ and R ３２ , R ３２ and R ３３ , R ３３ and R ３４ , R ３４ and R ３５ , R ３５ and R ３６ , R ４１ and R ４２ , R ５１ and R ５２ , R ５２ and R ５３ When there are multiple m atoms, R is bonded to adjacent carbon atoms. ４１ When there are multiple m' atoms, R is bonded to adjacent carbon atoms. ４２ When there are multiple l atoms, R atoms bond to adjacent carbon atoms. ５１ When there are multiple l' atoms, R is bonded to adjacent carbon atoms. ５２ When there are multiple l'' atoms, R is bonded to adjacent carbon atoms. ５３ This refers to a pair of rings. The ring may be an aromatic hydrocarbon ring or a heteroaromatic ring.

[0188] m, m', l, l', and l" each represent the number of substituents, where m and m' are integers from 0 to 4, and l, l', and l" are integers from 0 to 5.

[0189] Also, when Z １ is a nitrogen atom, R ４３ is any one of a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, and a substituted or unsubstituted silyl group. When Z １ is other than a nitrogen atom, R ４３ is a hydrogen atom.

[0190] * represents the bonding position in R １１ to R １８ and R ａ in the general formula (6). The general formulas (6a) to (6d) may be directly bonded to the Cy Ａ ring depending on the bonding position of *.

[0191] As R ａ , specifically, an alkyl group, fluorene, carbazole, dibenzofuran, dibenzothiophene, diphenylphosphine oxide, and in the general formula (6c), when Z １ is an oxygen atom or a sulfur atom and Y ３ is a nitrogen atom, a condensed heterocyclic ring, or a condensed heterocyclic ring in triphenylene in which one or two benzene rings contain one nitrogen atom are preferably mentioned.

[0192] Representative compounds represented by the general formula (6) include, for example, the following, but are not limited thereto.

[0193]

[0194]

[0195]

[0196]

[0197] [Organic Light-Emitting Device] Next, an organic light-emitting device according to this embodiment will be described. The organic light-emitting device according to this embodiment has a first electrode, a second electrode, and an organic compound layer disposed between these electrodes. One of the first electrode and the second electrode is an anode and the other is a cathode. In the organic light-emitting device according to this embodiment, the organic compound layer may be a single layer or a laminate consisting of multiple layers, as long as it has a light-emitting layer. If the organic compound layer is a laminate consisting of multiple layers, the organic compound layer may have a hole injection layer, a hole transport layer, an electron blocking layer, a hole / exciton blocking layer, an electron transport layer, an electron injection layer, etc., in addition to the light-emitting layer. The light-emitting layer may be a single layer or a laminate consisting of multiple layers. If there are multiple light-emitting layers, a charge generation layer may be provided between the light-emitting layers. The light-emitting layer may be a single layer or a multi-layer, and it is also possible to mix it with the light-emitting color of this embodiment by including a light-emitting material having another light-emitting color. A multi-layer means a state in which a light-emitting layer and another light-emitting layer are laminated together. In this case, the emission color of the organic light-emitting element may be blue, green, red, white, or an intermediate color. If white is used, it will emit light in combination with blue, green, red, or an intermediate color. The film deposition method may also be either vapor deposition or coating.

[0198] In this embodiment, in addition to the first and second compounds described above, conventionally known low-molecular-weight and high-molecular-weight hole-injecting or hole-transporting compounds, host materials, luminescent compounds, electron-injecting or electron-transporting compounds, etc., can be used together as needed. Examples of these compounds are listed below.

[0199] As hole-injection transport materials, materials with high hole mobility are preferred to facilitate hole injection from the anode and to transport the injected holes to the light-emitting layer. Furthermore, materials with a high glass transition temperature are preferred to suppress crystallization of organic compounds in the organic light-emitting element. Examples of low-molecular-weight and high-molecular-weight materials with hole-injection transport properties include triarylamine derivatives, arylcarbazole derivatives, phenylenediamine derivatives, stilbene derivatives, phthalocyanine derivatives, porphyrin derivatives, poly(vinylcarbazole), poly(thiophene), and other conductive polymers. In addition, the above-mentioned hole-injection transport materials are also suitably used in electron-blocking layers. Moreover, when preparing the hole-injection layer by coating, a mixture of polyethylenedioxythiophene and polystyrene sulfonic acid (PEDOT:PSS), which is commonly used as a hole-injection material, may be used.

[0200] The following are specific examples of compounds used as hole injection transport materials, but of course, they are not the only ones.

[0201]

[0202]

[0203] Among the hole-injection transport materials listed, HT16 to HT18 can reduce the driving voltage when used in the layer in contact with the anode. HT16 is widely used in organic light-emitting devices. HT2 to HT7, HT10, HT12, and HT22 to 28 may be used in the organic compound layer adjacent to HT16. Polymer compounds such as hole-transporting polyphenylene vinylene (PPV), polyfluorene (PF), polyvinylcarbazole (PVK), and their derivatives may also be used. In addition, for example, SiO ２ It is also possible to use inorganic insulating layers such as SiN or organosilicon polymers such as siloxane. Furthermore, multiple materials may be used in a single organic compound layer.

[0204] In addition to the luminescent layer in this embodiment, when a luminescent layer is provided by lamination, for example, compounds such as those listed below can be used. Guest materials mainly involved in luminescence include donor-acceptor type organic compounds, boron-containing complexes, indocarbazole fused ring compounds, fused ring compounds (e.g., fluorene derivatives, naphthalene derivatives, pyrene derivatives, perylene derivatives, tetracene derivatives, anthracene derivatives, rubrene, etc.), quinacridone derivatives, coumarin derivatives, stilbene derivatives, organoaluminum complexes such as tris(8-quinolinolate)aluminum, iridium complexes, platinum complexes, rhenium complexes, copper complexes, europium complexes, ruthenium complexes, and polymer derivatives such as poly(phenylenevinylene) derivatives, poly(fluorene) derivatives, and poly(phenylene) derivatives. Furthermore, when a luminescent layer is produced by coating, polymer compounds with luminescence properties are mainly used. This is because polymer compounds tend to exhibit high glass transition temperatures, making them less prone to crystallization compared to low molecular weight systems. Specific examples of materials used include polymer compounds such as polyphenylene vinylene (PPV), polyfluorene (PF), polyvinylcarbazole (PVK), and their derivatives.

[0205] The following are some specific examples of compounds used as luminescent materials, but of course, they are not the only ones.

[0206]

[0207]

[0208]

[0209] The following are specific examples of compounds used as host or assist materials in the light-emitting layer, but of course, they are not limited to these.

[0210]

[0211]

[0212] As electron-transporting materials, any material capable of transporting electrons injected from the cathode to the light-emitting layer can be arbitrarily selected, taking into consideration the balance with the hole mobility of the hole-transporting material. Examples of materials with electron-transporting properties include oxadiazole derivatives, pyrazine derivatives, triazole derivatives, triazine derivatives, quinoline derivatives, quinoxaline derivatives, phenanthroline derivatives, organoaluminum complexes, and fused ring compounds (e.g., fluorene derivatives, naphthalene derivatives, chrysene derivatives, anthracene derivatives, etc.). Furthermore, the above electron-transporting materials are also suitably used in hole-blocking layers.

[0213] The following are specific examples of compounds used as electron transport materials, but of course, they are not the only ones.

[0214]

[0215] Electron-injectable materials can be arbitrarily selected from those that allow for easy electron injection from the cathode, taking into consideration the balance with hole injection properties. Organic compounds include n-type dopants and reducing dopants. Examples include alkali metal compounds such as lithium fluoride, lithium complexes such as lithium quinolinol, benzimidazolidene derivatives, imidazolidene derivatives, fluvalene derivatives, and acridine derivatives.

[0216] It can also be used in combination with the electron transport materials mentioned above.

[0217] [Ink Composition] Next, the ink composition according to this embodiment will be described. The ink composition according to this embodiment has the above-described first compound and second compound. By using the ink composition according to this embodiment, it becomes possible to form, by a coating method, a layer made of an organic compound constituting the organic light-emitting device according to this embodiment, particularly a light-emitting layer, and an element with a relatively large area can be easily manufactured at a relatively low cost. Examples of the solvent for dissolving the compound in this embodiment include toluene, xylene, mesitylene, dioxane, methylnaphthalene, tetrahydrofuran, diglyme, 1,2-dichlorobenzene, 1,2-dichloropropane, and the like. These solvents can be used alone or in combination of two or more. Among these, in terms of easily obtaining a thin film having a uniform thickness, it is preferable to use a solvent having an appropriate evaporation rate, specifically, a solvent having a boiling point of about 70°C to 200°C. Further, the ink composition according to this embodiment may contain a compound serving as an additive. Examples of the compound serving as an additive include the above-described known light-emitting layer host material, hole-transporting material, light-emitting material, electron-transporting material, and the like.

[0218] The concentration of the compound in the ink composition according to this embodiment is preferably 0.05% by mass or more and 20% by mass or less, more preferably 0.1% by mass or more and 5% by mass or less, based on the entire composition.

[0219] The ink composition according to this embodiment can be formed into a film by a spin coating method, bar coating method, slit coating method, inkjet method, nozzle coating method, casting method, gravure printing method, or the like. The organic light-emitting device of this embodiment can be used to construct a display device such as a display by forming the organic light-emitting device of this embodiment on an electrode formed in a pixel pattern.

[0220] [Configuration of Organic Light-Emitting Device] Hereinafter, the constituent members constituting the organic light-emitting device of this embodiment will be described.

[0221] An organic light-emitting element is provided on a substrate by forming an insulating layer, a first electrode, an organic compound layer, and a second electrode. A protective layer, a color filter, a microlens, etc., may be provided on the second electrode. If a color filter is provided, a planarization layer may be provided between it and the protective layer. The planarization layer can be made of acrylic resin or the like. The same applies when a planarization layer is provided between the color filter and the microlens.

[0222] <Substrate> Examples of substrates include quartz, glass, silicon wafers, resins, and metals. The substrate may also be equipped with switching elements such as transistors and wiring, and an insulating layer may be provided on top of them. The insulating layer can be made of any material that allows for the formation of contact holes between it and the first electrode, while ensuring insulation from wiring that is not connected. For example, resins such as polyimide, silicon oxide, and silicon nitride can be used.

[0223] <Electrodes> A pair of electrodes can be used. The pair of electrodes is a first electrode and a second electrode. Specifically, the pair of electrodes may be an anode and a cathode. When an electric field is applied in the direction in which the organic light-emitting element emits light, the electrode with the higher potential is the anode, and the other is the cathode. Alternatively, the electrode that supplies holes to the light-emitting layer can be the anode, and the electrode that supplies electrons can be the cathode.

[0224] The anode material should ideally have a high work function. For example, elemental metals such as gold, platinum, silver, copper, nickel, palladium, cobalt, selenium, vanadium, and tungsten, or mixtures containing these, or alloys combining them, as well as metal oxides such as tin oxide, zinc oxide, indium oxide, tin-indium oxide (ITO), and zinc-indium oxide can be used. Conductive polymers such as polyaniline, polypyrrole, and polythiophene can also be used.

[0225] These electrode materials may be used individually or in combination of two or more. Furthermore, the anode may consist of a single layer or multiple layers.

[0226] When used as a reflective electrode, materials such as chromium, aluminum, silver, titanium, tungsten, molybdenum, or alloys or laminates thereof can be used. These materials can also function as reflective films without serving as electrodes. Furthermore, when used as a transparent electrode, oxide transparent conductive layers such as indium tin oxide (ITO) or indium zinc oxide can be used, but are not limited to these. Photolithography techniques can be used to form the electrodes.

[0227] Materials with a low work function are preferred for the cathode. Examples include alkali metals such as lithium, alkaline earth metals such as calcium, and elemental metals or mixtures containing aluminum, titanium, manganese, silver, lead, and chromium. Alternatively, alloys combining these elemental metals can also be used. For example, magnesium-silver, aluminum-lithium, aluminum-magnesium, silver-copper, and zinc-silver can be used. Metal oxides such as indium tin oxide (ITO) can also be used. These electrode materials may be used individually or in combination of two or more. The cathode may also be a single-layer or multi-layer structure. Among these, silver is preferred, and a silver alloy is even more preferred to reduce silver aggregation. The alloy ratio is not important as long as silver aggregation is reduced. For example, the ratio of silver to other metals may be 1:1, 3:1, etc.

[0228] The cathode may be a top-emission element using an oxide conductive layer such as ITO, or a bottom-emission element using a reflective electrode such as aluminum (Al), and is not particularly limited. The method for forming the cathode is not particularly limited, but using DC and AC sputtering methods is more preferable because it provides good film coverage and makes it easier to reduce resistance.

[0229] <Organic Compound Layer> The organic compound layer may be formed as a single layer or as multiple layers. If there are multiple layers, they may be called a hole injection layer, hole transport layer, electron blocking layer, light-emitting layer, hole blocking layer, electron transport layer, or electron injection layer depending on their function. The organic compound layer is mainly composed of organic compounds, but may also contain inorganic atoms and inorganic compounds. For example, it may contain copper, lithium, magnesium, barium, ytterbium, aluminum, iridium, platinum, molybdenum, zinc, etc. The organic compound layer may be placed between the first electrode and the second electrode, or it may be placed in contact with the first electrode and the second electrode.

[0230] The organic compound layers constituting the organic light-emitting element according to this embodiment (hole injection layer, hole transport layer, electron blocking layer, light-emitting layer, hole blocking layer, electron transport layer, electron injection layer, etc.) are formed by the method described below.

[0231] The organic compound layer constituting the organic light-emitting element according to this embodiment can be formed using a dry process such as vacuum deposition, ionization deposition, sputtering, or plasma deposition. Alternatively, instead of a dry process, a wet process can be used in which the layer is formed by dissolving the compound in a suitable solvent and applying a known coating method (e.g., spin coating, dipping, casting, LB method, inkjet method, etc.).

[0232] By forming layers using methods such as vacuum deposition or solution coating, crystallization is less likely to occur, resulting in excellent stability over time. Furthermore, when forming films using coating methods, it is possible to combine the film with an appropriate binder resin.

[0233] Examples of the binder resins mentioned above include, but are not limited to, polyvinylcarbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenolic resin, epoxy resin, silicone resin, and urea resin.

[0234] Furthermore, these binder resins may be used individually as homopolymers or copolymers, or as a mixture of two or more types. Additionally, known additives such as plasticizers, antioxidants, and UV absorbers may be used in combination as needed.

[0235] <Protective Layer> A protective layer may be provided on the cathode. For example, by bonding glass with a desiccant to the cathode, the intrusion of water and other substances into the organic compound layer can be reduced, thereby reducing the occurrence of display defects. In another embodiment, a passivation film such as silicon nitride may be provided on the cathode to reduce the intrusion of water and other substances into the organic compound layer. For example, after forming the cathode, the material may be transported to another chamber without breaking the vacuum, and a silicon nitride film with a thickness of 2 μm may be formed by CVD to serve as a protective layer. A protective layer may also be provided using atomic deposition (ALD) after the film formation by CVD. The material of the film formed by ALD is not limited, but may be silicon nitride, silicon oxide, aluminum oxide, etc. Silicon nitride may be further formed by CVD on the film formed by ALD. The film formed by ALD may have a thinner film thickness than the film formed by CVD. Specifically, the film thickness of the film formed by the ALD method may be 50% or less, or even 10% or less, of the film thickness of the film formed by the CVD method.

[0236] <Color Filter> A color filter may be provided on top of the protective layer. For example, a color filter that takes into account the size of the organic light-emitting element may be provided on a separate substrate and bonded to the substrate on which the organic light-emitting element is provided, or a color filter may be patterned on the protective layer as described above using photolithography technology. The color filter may be made of polymer.

[0237] <Planarizing Layer> A planarizing layer may be provided between the color filter and the protective layer. The planarizing layer is provided for the purpose of reducing the unevenness of the layer below. It may also be called a material resin layer without limiting its purpose. The planarizing layer may be composed of an organic compound, and may be low molecular weight or high molecular weight, but high molecular weight is preferred.

[0238] The planarization layer may be provided above or below the color filter, and its constituent materials may be the same or different. Specifically, examples include polyvinylcarbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenolic resin, epoxy resin, silicone resin, urea resin, etc.

[0239] <Microlenses> The organic light-emitting element according to this embodiment may have optical elements such as microlenses on the light-emitting side. The microlenses may be made of acrylic resin, epoxy resin, etc. The microlenses may be used to increase the amount of light extracted from the organic light-emitting element or to control the direction of the extracted light. The microlenses may have a hemispherical shape. If they have a hemispherical shape, among the tangents that are tangent to the hemisphere, there is a tangent that is parallel to the insulating layer, and the point of contact between that tangent and the hemisphere is the vertex of the microlens. The vertex of the microlens can be similarly determined in any cross-sectional view. That is, among the tangents that are tangent to the semicircle of the microlens in the cross-sectional view, there is a tangent that is parallel to the insulating layer, and the point of contact between that tangent and the semicircle is the vertex of the microlens.

[0240] Furthermore, the midpoint of a microlens can also be defined. In the cross-section of a microlens, a line segment can be imagined from the point where one arc shape begins to the point where another arc shape begins, and the midpoint of this line segment can be called the midpoint of the microlens. The cross-section used to determine the vertices and midpoints may be a cross-section perpendicular to the insulating layer.

[0241] <Opposite Substrate> An opposite substrate may be provided on the planarization layer. The opposite substrate is called an opposite substrate because it is provided in a position corresponding to the aforementioned substrate. The constituent material of the opposite substrate may be the same as that of the aforementioned substrate. The opposite substrate may be a second substrate if the aforementioned substrate is referred to as the first substrate.

[0242] <Pixel Circuit> The light-emitting device may have a pixel circuit connected to a light-emitting element. The pixel circuit may be an active-matrix type that independently controls the emission of light from a first light-emitting element and a second light-emitting element. The active-matrix type circuit may be voltage-programmed or current-programmed. The drive circuit has a pixel circuit for each pixel. The pixel circuit may have a light-emitting element, a transistor that controls the emission brightness of the light-emitting element, a transistor that controls the emission timing, a capacitor that holds the gate voltage of the transistor that controls the emission brightness, and a transistor for connecting to GND without going through the light-emitting element.

[0243] The light-emitting device has a display area and a peripheral area arranged around the display area. The display area has a pixel circuit, and the peripheral area has a display control circuit. The mobility of the transistors constituting the pixel circuit may be smaller than the mobility of the transistors constituting the display control circuit.

[0244] The slope of the current-voltage characteristics of the transistors constituting the pixel circuit may be smaller than the slope of the current-voltage characteristics of the transistors constituting the display control circuit. The slope of the current-voltage characteristics can be measured using the so-called Vg-Ig characteristic.

[0245] The transistors that make up the pixel circuit are transistors connected to light-emitting elements, such as the first light-emitting element.

[0246] <Pixels> An organic light-emitting device has multiple pixels. Each pixel has subpixels that emit light of a different color from the others. The subpixels may each have, for example, RGB emission colors. A region of the pixel, also called the pixel aperture, emits light.

[0247] Pixels can take on known arrangements in a plan view. For example, they may be in a stripe arrangement, delta arrangement, pentile arrangement, or Bayer arrangement. The shape of subpixels in a plan view may be any known shape. For example, rectangles, rhombuses, hexagons, etc. Of course, even if it is not a precise shape, if it is close to a rectangle, it is included in the category of rectangles. The shape of subpixels and the pixel arrangement can be used in combination.

[0248] [Applications of Organic Light-Emitting Devices] The organic light-emitting device according to this embodiment can be used as a component of display devices and lighting devices. Other applications include exposure light sources for electrophotographic image forming apparatuses, backlights for liquid crystal display devices, and light-emitting devices with a color filter in a white light source.

[0249] The display device may also be an image information processing device that has an image input unit for receiving image information from an area CCD, linear CCD, memory card, etc., an information processing unit for processing the input information, and displays the input image on the display unit.

[0250] Furthermore, the display unit of the imaging device or inkjet printer may have a touch panel function. The driving method for this touch panel function may be infrared, capacitive, resistive, or electromagnetic induction, and is not particularly limited. The display device may also be used as the display unit of a multifunction printer.

[0251] Next, a display device according to this embodiment will be described with reference to the drawings. Figures 1A and 1B are schematic cross-sectional views showing an example of a display device having an organic light-emitting element and a transistor connected to the organic light-emitting element. The transistor is an example of an active element. The transistor may also be a thin-film transistor (TFT).

[0252] Figure 1A shows an example of a pixel, which is a component of the display device according to this embodiment. The pixel has sub-pixels 20. The sub-pixels are divided into 20R, 20G, and 20B based on their light emission. The light emission color may be distinguished by the wavelength emitted from the light-emitting layer, or the light emitted from the sub-pixel may be selectively transmitted or color-converted by a color filter or the like. Each sub-pixel has a reflective electrode 12 which is a first electrode, an insulating layer 13 covering the end of the reflective electrode 12, an organic compound layer 14 covering the first electrode and the insulating layer, a transparent electrode 15, a protective layer 16, and a color filter 17 on an interlayer insulating layer 1.

[0253] The interlayer insulating layer 11 may have transistors or capacitive elements arranged in the layer below or inside it. The transistor and the first electrode may be electrically connected via a contact hole or the like (not shown).

[0254] The insulating layer 13 is also called a bank or pixel separation layer. It covers the end of the first electrode and is arranged to surround the first electrode. The portion without the insulating layer is in contact with the organic compound layer 14 and becomes the light-emitting region.

[0255] The second electrode 15 may be a transparent electrode, a reflective electrode, or a semi-transparent electrode.

[0256] The protective layer 16 reduces the penetration of moisture into the organic compound layer 14. Although the protective layer 16 is shown as a single layer, it may be made up of multiple layers. Each layer may contain an inorganic compound layer and an organic compound layer.

[0257] The color filters 17 are classified into 17R, 17G, and 17B according to their color. The color filters may be formed on a planarization film (not shown). Alternatively, the color filters may have a resin protective layer (not shown). The color filters 17 may also be formed on a protective layer 16. Alternatively, they may be bonded together after being placed on an opposing substrate such as a glass substrate.

[0258] The display device in Figure 1B shows an organic light-emitting element 36 and a TFT 28 as an example of a transistor. A substrate 21 made of glass, silicon, or the like is provided, with an insulating layer 22 on top of it. An active element 28 such as a TFT is placed on the insulating layer 22, and the gate electrode 23, gate insulating film 24, and semiconductor layer 25 of the active element are arranged thereon. The active element 28 is also composed of a semiconductor layer 25, a drain electrode 26, and a source electrode 27. An insulating film 29 is provided on top of the active element 28. The anode 31 and the source electrode 27 that constitute the organic light-emitting element 36 are connected via a contact hole 30 provided in the insulating film.

[0259] Furthermore, the method of electrical connection between the electrodes (anode, cathode) included in the organic light-emitting element 36 and the electrodes (source electrode, drain electrode) included in the TFT is not limited to the configuration shown in Figure 1B. In other words, it is sufficient for either the anode or cathode to be electrically connected to either the TFT source electrode or the drain electrode. TFT refers to a thin-film transistor.

[0260] In the display device shown in Figure 1B, the organic compound layer 32 is depicted as a single layer, but the organic compound layer 32 may consist of multiple layers. A first protective layer 34 and a second protective layer 35 are provided on the cathode 33 to reduce the degradation of the organic light-emitting element.

[0261] In the display device shown in Figure 1B, a transistor is used as the switching element, but other switching elements may be used instead.

[0262] Furthermore, the transistor used in the display device shown in Figure 1B is not limited to a transistor using a single-crystal silicon wafer; it may also be a thin-film transistor having an active layer on an insulating surface of the substrate. Examples of the active layer include non-single-crystal silicon such as single-crystal silicon, amorphous silicon, and microcrystalline silicon, and non-single-crystal oxide semiconductors such as indium zinc oxide and indium gallium zinc oxide. Thin-film transistors are also called TFT elements.

[0263] The transistors included in the display device shown in Figure 1B may be formed within a substrate such as a Si substrate. Here, "formed within a substrate" means that the transistors are fabricated by processing the substrate itself, such as a Si substrate. In other words, having transistors within a substrate can be seen as the substrate and transistors being formed as a single unit.

[0264] The organic light-emitting element according to this embodiment has its luminescence controlled by a TFT, which is an example of a switching element, and by providing multiple organic light-emitting elements on one surface, an image can be displayed according to the luminescence of each element. The switching element according to this embodiment is not limited to a TFT, but may also be a transistor made of low-temperature polysilicon, or an active matrix driver formed on a substrate such as a Si substrate. "On the substrate" can also mean "within the substrate." Whether to provide a transistor within the substrate or to use a TFT is selected depending on the size of the display area; for example, if the size is about 0.5 inches, it is preferable to provide the organic light-emitting element on a Si substrate.

[0265] Figure 2 is a schematic diagram showing an example of a display device according to this embodiment. The display device 1000 may have a touch panel 1003, a display panel 1005, a frame 1006, a circuit board 1007, and a battery 1008 between the upper cover 1001 and the lower cover 1009. The display panel 1005 has an organic light-emitting element according to this embodiment. Flexible printed circuits FPCs 1002 and 1004 are connected to the touch panel 1003 and the display panel 1005, respectively. Transistors are printed on the circuit board 1007. The battery 1008 does not need to be provided if the display device is not a portable device, or it may be provided in a different location even if it is a portable device.

[0266] The display device according to this embodiment may have a color filter having red, green, and blue colors. The color filter may have the red, green, and blue colors arranged in a delta array.

[0267] The display device according to this embodiment may be used in the display unit of a mobile terminal. In that case, it may have both display and operation functions. Examples of mobile terminals include smartphones and other mobile phones, tablets, and head-mounted displays.

[0268] The display device according to this embodiment may be used in the display unit of an imaging device having an image sensor that receives light that has passed through an optical unit. The imaging device may have a display unit that displays information acquired by the image sensor. Furthermore, the display unit may be a display unit exposed to the outside of the imaging device, or a display unit located inside the viewfinder. The imaging device may be a digital camera or a digital video camera.

[0269] Figure 3A is a schematic diagram showing an example of an imaging device according to this embodiment. The imaging device 1100 may include a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The viewfinder 1101 and the rear display 1102 have organic light-emitting elements according to this embodiment. In that case, the viewfinder 1101 and the rear display 1102 may display not only the image to be captured, but also environmental information, imaging instructions, etc. Environmental information may include the intensity of ambient light, the direction of ambient light, the speed at which the subject is moving, the possibility of the subject being obscured by an obstacle, etc.

[0270] Since the optimal timing for imaging is very short, it is best to display the information as quickly as possible. Therefore, it is preferable to use a display device using the organic light-emitting element according to this embodiment, because organic light-emitting elements have a fast response speed.

[0271] The imaging device 1100 may further include an optical section (not shown). The lenses in the optical section may be one or more, and they form an image on the image sensor housed in the housing 1104. The focus can be adjusted by adjusting the relative positions of the multiple lenses. This operation can also be performed automatically. The imaging device may also be called a photoelectric converter. The photoelectric converter does not capture images sequentially, but may include imaging methods such as detecting the difference from the previous image or extracting from an image that is always being recorded.

[0272] Figure 3B is a schematic diagram showing an example of an electronic device according to this embodiment. The electronic device 1200 has a display unit 1201, an operation unit 1202, and a housing 1203. The housing 1203 may have a circuit, a printed circuit board having the circuit, a battery, and a communication unit. The operation unit 1202 may be a button or a touch panel type response unit. The operation unit may also be a biometric recognition unit that recognizes fingerprints to unlock or otherwise perform actions. An electronic device having a communication unit can also be called a communication device. The electronic device may further have a camera function by including a lens and an image sensor. Images captured by the camera function are displayed on the display unit. Examples of electronic devices include smartphones and laptop computers.

[0273] Figures 4A and 4B are schematic diagrams showing an example of a display device according to this embodiment. Figure 4A is a display device such as a television monitor or a PC monitor. The display device 1300 has a housing 1301 and a display unit 1302. An organic light-emitting element according to this embodiment is used in the display unit 1302.

[0274] The display device 1300 may have a housing 1301 and a base 1303 that supports the display unit 1302. The base 1303 is not limited to the form shown in Figure 4A. The lower edge of the housing 1301 may also serve as the base.

[0275] Furthermore, the housing 1301 and the display unit 1302 may be curved. The radius of curvature may be between 5000 mm and 6000 mm.

[0276] Figure 4B is a schematic diagram showing another example of a display device according to this embodiment. The display device 1310 in Figure 4B is configured to be foldable and is a so-called foldable display device. The display device 1310 has a first display unit 1311, a second display unit 1312, a housing 1313, and a bending point 1314. The first display unit 1311 and the second display unit 1312 have organic light-emitting elements according to this embodiment. The first display unit 1311 and the second display unit 1312 may be a single display device without seams. The first display unit 1311 and the second display unit 1312 can be separated at the bending point. The first display unit 1311 and the second display unit 1312 may each display different images, or the first and second display units may together display a single image.

[0277] Figure 5A is a schematic diagram showing an example of a lighting device according to this embodiment. The lighting device 1400 may have a housing 1401, a light source 1402, and a circuit board 1403. The light source 1402 has an organic light-emitting element according to this embodiment. The lighting device 1400 may have an optical film 1404 to improve the color rendering of the light source. The lighting device 1400 may also have a light diffusion section 1405 to effectively diffuse the light from the light source. The lighting device 1400 having a light diffusion section 1405 allows light to be delivered over a wide area. The optical film 1404 and the light diffusion section 1405 may be provided on the light-emitting side of the lighting. A cover may be provided on the outermost part as needed.

[0278] The lighting device is, for example, a device for illuminating a room. The lighting device may emit white light, daylight white light, or any other color from blue to red. The lighting device according to this embodiment may have a dimming circuit for adjusting the brightness of these colors. The lighting device according to this embodiment may also have a power supply circuit connected to the organic light-emitting element according to this embodiment. The power supply circuit may be a circuit that converts AC voltage to DC voltage. White is defined as a color temperature of 4200K, and daylight white is defined as a color temperature of 5000K. The lighting device according to this embodiment may further have a color filter.

[0279] Furthermore, the lighting device according to this embodiment may have a heat dissipation section. The heat dissipation section releases heat from inside the device to the outside, and examples include metals, ceramics, and the like with high thermal conductivity.

[0280] Figure 5B is a schematic diagram of an automobile, which is an example of a mobile body according to this embodiment. The automobile has a taillight, which is an example of a lighting device. The automobile 1500 has a taillight 1501 and a body 1503, and the taillight may illuminate when the brakes are applied or the like. The body 1503 may also be called the machine body. The automobile 1500 may have a window 1502 attached to the body 1503.

[0281] The tail lamp 1501 has an organic light-emitting element according to this embodiment. The tail lamp may have a protective member to protect the light source. The protective member has a reasonably high strength and can be made of any transparent material, but it is preferably made of polycarbonate or the like. A frangic acid derivative, an acrylonitrile derivative, or the like may be mixed with the polycarbonate.

[0282] The window 1502 may be a transparent display if it is not a window for checking the front and rear of the automobile. The transparent display has an organic light-emitting element according to this embodiment. In this case, the constituent materials such as electrodes of the organic light-emitting element according to this embodiment are made of transparent material.

[0283] The mobile body according to this embodiment includes a drive force generating unit that generates a driving force mainly used for the movement of the mobile body, and one or both of a rotating body mainly used for the movement of the mobile body. The drive force generating unit may be an engine, a motor, etc. The rotating body may be a tire, a wheel, a ship's propeller, an aircraft's propeller, etc. Specifically, it may be a bicycle, an automobile, a train, a ship, an aircraft, a drone, etc. The mobile body may have a body and a light fixture provided on the body. The light fixture may emit light to make the position of the body known.

[0284] With reference to Figures 6A and 6B, examples of applications of the display devices of each embodiment described above will be explained. The display device can be applied to systems that can be worn as wearable devices, such as smart glasses, head-mounted displays, and smart contact lenses. A display device that can be used in a wearable device may have an imaging device capable of photoelectric conversion of visible light and a display device capable of emitting visible light.

[0285] Figures 6A and 6B are schematic diagrams showing an example of eyeglasses (smart glasses) according to this embodiment. The eyeglasses 1600 (smart glasses) will be described using Figure 6A. The eyeglasses 1600 has a display unit on the back side of the lens 1601. The display unit has an organic light-emitting element according to this embodiment. Furthermore, an imaging device 1602 such as a CMOS sensor or SPAD may be provided on the front side of the lens 1601.

[0286] The eyeglasses 1600 further include a control device 1603. The control device 1603 functions as a power supply that provides power to the imaging device 1602 and the display unit. The control device 1603 also controls the operation of the imaging device 1602 and the display unit. The lens 1601 has an optical system formed therein for focusing light from the imaging device 1602 and the display unit.

[0287] The eyeglasses 1610 (smart glasses) will be described using Figure 6B. The eyeglasses 1610 have a control device 1612, and the control device 1612 is equipped with a display device having an organic light-emitting element according to this embodiment. The control device 1612 may further have an imaging device corresponding to the imaging device 1602. An optical system for projecting light emitted from the control device 1612 is formed on the lens 1611, and an image is projected onto the lens 1611. The control device 1612 functions as a power supply that supplies power to the imaging device and the display device, and also controls the operation of the imaging device and the display device. The control device may have a gaze detection unit that detects the wearer's gaze. Gaze detection may use infrared light. The infrared light-emitting unit emits infrared light towards the eyeball of the user who is gazing at the displayed image. An image of the eyeball is obtained by detecting the reflected light from the eyeball of the emitted infrared light with an imaging unit having a light-receiving element. By having a reduction means that reduces the light from the infrared light-emitting unit to the display unit in planar view, the deterioration of image quality is reduced.

[0288] The control device 1612 detects the user's gaze toward the displayed image from the image of the eyeball obtained by imaging with infrared light. Any known method can be applied to gaze detection using the image of the eyeball. For example, a gaze detection method based on the Purkinje image obtained by the reflection of the irradiated light from the cornea can be used.

[0289] More specifically, gaze detection processing is performed based on the pupil-corneal reflection method. Using the pupil-corneal reflection method, a gaze vector representing the orientation (rotation angle) of the eyeball is produced based on the pupil image and Purkinje image contained in the captured image of the eyeball, thereby detecting the user's gaze.

[0290] The display device according to this embodiment may include an imaging device having a light-receiving element, and the display image of the display device may be controlled based on the user's gaze information from the imaging device.

[0291] Specifically, the display device determines a first field of view that the user is fixated on, and a second field of view other than the first field of view, based on gaze information. The first and second field of view may be determined by the control device of the display device, or they may be determined by an external control device and received by the display device. Within the display area of ​​the display device, the display resolution of the first field of view may be controlled to be higher than the display resolution of the second field of view. In other words, the resolution of the second field of view may be lower than that of the first field of view.

[0292] Furthermore, the display area has a first field of view area and a second field of view area different from the first field of view area, and based on gaze information, a higher priority area is determined from the first field of view area and the second field of view area. The first field of view area and the second field of view area may be determined by the control device of the display device, or they may be determined by an external control device and received. The resolution of the higher priority area may be controlled to be higher than the resolution of the areas other than the higher priority area. In other words, the resolution of areas with relatively lower priority may be lowered.

[0293] AI may be used to determine the first field of view area and the field of view areas with higher priority. The AI ​​may be a model configured to estimate the angle of line of sight and the distance to the target object at the end of the line of sight from the image of the eye, using the image of the eye and the direction the eye was actually looking in the image as training data. The AI ​​may be provided by the display device, the imaging device, or an external device. If the external device has the AI, it can preferably be applied to smart glasses that further have an imaging device for capturing images of the outside. The smart glasses can display the captured external information in real time.

[0294] Figure 7A is a schematic diagram showing an example of an image forming apparatus according to this embodiment. The image forming apparatus 1700 is an electrophotographic image forming apparatus and includes a photoreceptor 1707, an exposure light source 1708, a charging unit 1710, a developing unit 1711, a transfer unit 1712, a transport roller 1713, and a fuser 1715. Light 1709 is irradiated from the exposure light source 1708, and an electrostatic latent image is formed on the surface of the photoreceptor 1707. This exposure light source 1708 has an organic light-emitting element according to this embodiment. The developing unit 1711 contains toner or the like. The charging unit 1710 charges the photoreceptor 1707. The transfer unit 1712 transfers the developed image to a recording medium 1714. The transport roller 1713 transports the recording medium 1714. The recording medium 1714 is, for example, paper. The fuser 1715 fixes the image formed on the recording medium 1714.

[0295] Figures 7B and 7C are diagrams showing an exposure light source 1708, schematic diagrams showing how multiple light-emitting units 1726 are arranged on a long substrate. Arrows 1727 indicate the direction of the column in which the organic light-emitting elements are arranged. This column direction is the same as the direction of the axis in which the photoreceptor 1707 rotates. This direction can also be called the long axis direction of the photoreceptor 1707. Figure 7B shows a configuration in which the light-emitting units 1726 are arranged along the long axis direction of the photoreceptor 1707. Figure 7C is a different configuration from Figure 7B, in which the light-emitting units 1726 are arranged alternately in the column direction in the first column and the second column, respectively. The first column and the second column are arranged at different positions in the row direction. In the first column, multiple light-emitting units 1726 are arranged with intervals between them. In the second column, light-emitting units 1726 are located at positions corresponding to the intervals between the light-emitting units 1726 in the first column. In other words, multiple light-emitting units 1726 are also arranged at intervals in the row direction. The arrangement in Figure 7C can also be described as a grid arrangement, a houndstooth arrangement, or a checkerboard pattern.

[0296] As described above, by using the device employing the organic light-emitting element according to this embodiment, stable display with good image quality is possible even during long-term display.

[0297] [Included Configurations] The disclosure of this embodiment includes the following configurations.

[0298] (Configuration 1) An organic light-emitting element comprising a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, wherein the organic compound layer has a light-emitting layer, the light-emitting layer comprises a first compound and a second compound different from the first compound, the light-emitting lifetime of the first compound is 500 [nsec] or more, and the second compound is a fluorescent light-emitting material that satisfies the following formula [1]. １ (A) - E(λ) ｍａｘ )) × ε [1] S １ (A) [eV]: Lowest excited singlet energy λ of the first compound ｍａｘ [nm]: The absorption peak wavelength E (λ) of the absorption spectrum of the second compound, which is located at the longest wavelength end. ｍａｘ ) [eV]: λ ｍａｘ The corresponding energy ε[M] －１ ・cm －１ ]: λ of the second compound ｍａｘ Molar extinction coefficient at [nm]

[0299] (Configuration 2) An organic light-emitting element having a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, wherein the organic compound layer has a light-emitting layer, the light-emitting layer has a first compound and a second compound different from the first compound, the first compound is a compound in which the difference between the lowest excited singlet energy and the lowest excited triplet energy is 0.25 [eV] or less, and the second compound is a fluorescent light-emitting material that satisfies the following formula [1]. １ (A) - E(λ) ｍａｘ )) × ε [1] S １ (A) [eV]: Lowest excited singlet energy λ of the first compound ｍａｘ [nm]: The absorption peak wavelength E (λ) of the absorption spectrum of the second compound, which is located at the longest wavelength end. ｍａｘ ) [eV]: λ ｍａｘ The corresponding energy ε[M] －１ ・cm －１ ]: λ of the second compound ｍａｘ Molar extinction coefficient at [nm]

[0300] (Configuration 3) An organic light-emitting element comprising a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, wherein the organic compound layer has a light-emitting layer, the light-emitting layer comprises a first compound and a second compound different from the first compound, the light-emitting lifetime of the first compound is 500 [nsec] or more, the second compound is a fluorescent light-emitting material, and the value of formula [A] is 3.0 × 10 １４ The above-mentioned organic light-emitting device.

[0301] (Configuration 4) An organic light-emitting element comprising a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, wherein the organic compound layer has a light-emitting layer, the light-emitting layer comprises a first compound and a second compound different from the first compound, the first compound is a compound in which the difference between the lowest excited singlet energy and the lowest excited triplet energy is 0.25 [eV] or less, the second compound is a fluorescent light-emitting material, and the value of formula [A] is 3.0 × 10 １４ The above-mentioned organic light-emitting device.

[0302] (Configuration 5) The value of formula [A] is 3.0 × 10 １４ The organic light-emitting element according to configuration 1 or 2, characterized in that it is as described above.

[0303] (Configuration 6) The organic light-emitting element according to Configuration 1 or 3, characterized in that the difference between the lowest excited singlet energy and the lowest excited triplet energy of the first compound is 0.25 [eV] or less.

[0304] (Configuration 7) An organic light-emitting element according to any one of Configurations 1 to 6, characterized in that it satisfies the relationship in the following formula [2]: 8000 ≤ (S １ (A) - E(λ) ｍａｘ )) × ε ≤ 30000 [2]

[0305] (Configuration 8) An organic light-emitting element according to any one of Configurations 1 to 7, characterized in that it satisfies the relationship in the following formula [3]. 0.1 [eV] ≤ S １ (A) - E(λ) ｍａｘ ) [3]

[0306] (Configuration 9) An organic light-emitting element according to any one of Configurations 1 to 8, characterized in that it satisfies the relationship in the following formula [4]. １ (A) - E(λ) ｍａｘ )≦0.40 [eV] [4]

[0307] (Configuration 10) The above ε is 20000 [M －１ ・cm －１ The organic light-emitting element according to any one of configurations 1 to 7, characterized by being as described above.

[0308] (Configuration 11) The above ε is 250,000 [M －１ ・cm －１ The organic light-emitting element according to any one of configurations 1 to 8, characterized in that it is as follows.

[0309] (Configuration 12) An organic light-emitting element according to any one of Configurations 1 to 11, characterized in that the wavelength of the emission peak showing the highest emission intensity among the emission peaks of the first compound is longer than the wavelength of the emission peak showing the highest emission intensity among the emission peaks of the second compound.

[0310] (Configuration 13) The organic light-emitting element according to any one of Configurations 1 to 12, characterized in that the full width at half maximum of the emission peak showing the highest emission intensity among the emission peaks of the first compound is 90 nm or less.

[0311] (Configuration 14) The organic light-emitting element according to any one of Configurations 1 to 13, characterized in that the wavelength of the emission peak showing the highest emission intensity among the emission peaks of the second compound is 440 nm or more and 480 nm or less.

[0312] (Configuration 15) The organic light-emitting element according to any one of Configurations 1 to 14, characterized in that the full width at half maximum of the emission peak showing the highest emission intensity among the emission peaks of the second compound is 30 nm or less.

[0313] (Configuration 16) The organic light-emitting element according to any one of Configurations 1 to 15, characterized in that the first compound is a compound represented by the general formula (1).

[0314] (Configuration 17) The organic light-emitting element according to Configuration 16, characterized in that the first compound relating to the general formula (1) is a compound represented by the general formula (1a).

[0315] (Configuration 18) The organic light-emitting element according to Configuration 16, characterized in that the first compound relating to general formula (1) is a compound represented by either general formula (1b-1) or (1b-2).

[0316] (Configuration 19) The organic light-emitting element according to Configuration 16, characterized in that the first compound relating to the general formula (1) is a compound represented by the general formula (1c).

[0317] (Configuration 20) The organic light-emitting element according to any one of Configurations 1 to 15, characterized in that the first compound is a compound represented by any one of the general formulas (2) and (3).

[0318] (Configuration 21) The organic light-emitting element according to any one of Configurations 1 to 20, characterized in that the second compound is a compound represented by the general formula (4).

[0319] (Configuration 22) The organic light-emitting element according to any one of Configurations 1 to 20, characterized in that the second compound is represented by either of the general formulas (4a-1) or (4a-2).

[0320] (Configuration 23) The organic light-emitting element according to any one of Configurations 1 to 20, characterized in that the second compound is represented by the general formula (4a-3).

[0321] (Configuration 24) The organic light-emitting element according to any one of Configurations 1 to 20, characterized in that the second compound is represented by either of the general formulas (5-1) or (5-2).

[0322] (Configuration 25) The organic light-emitting element according to any one of Configurations 1 to 24, characterized in that the light-emitting layer has a third compound, and the lowest singlet excitation energy of the third compound is higher than the lowest singlet excitation energy of the first compound.

[0323] (Configuration 26) The organic light-emitting element according to Configuration 25, characterized in that the third compound is a compound represented by the general formula (6).

[0324] (Configuration 27) The organic light-emitting element according to any one of Configurations 1 to 26, characterized in that the mass ratio of the first compound in the light-emitting layer is greater than the mass ratio of the second compound.

[0325] (Configuration 28) The organic light-emitting element according to any one of Configurations 1 to 27, characterized in that the content of the second compound in the light-emitting layer is 0.5% by mass or more.

[0326] (Configuration 29) A display device having a plurality of pixels, wherein at least one of the plurality of pixels has an organic light-emitting element according to any one of Configurations 1 to 28 and a transistor connected to the organic light-emitting element.

[0327] (Configuration 30) A photoelectric conversion device comprising an optical unit having a plurality of lenses, an image sensor that receives light that has passed through the optical unit, and a display unit that displays an image captured by the image sensor, wherein the display unit has an organic light-emitting element as described in any of Configurations 1 to 28.

[0328] (Configuration 31) An electronic device comprising: a display unit having an organic light-emitting element as described in any of Configurations 1 to 28; a housing on which the display unit is provided; and a communication unit provided in the housing for communicating with the outside.

[0329] (Configuration 32) A lighting device characterized by comprising a light source having an organic light-emitting element as described in any of Configurations 1 to 28, and a light-diffusing part or optical film that transmits the light emitted by the light source.

[0330] (Configuration 33) A mobile body characterized by having a light fixture having an organic light-emitting element as described in any of Configurations 1 to 28, and a body on which the light fixture is provided.

[0331] The present invention will be explained below with reference to examples and comparative examples, but it is not limited to these configurations.

[0332] The compounds used in each example and comparative example are shown below. In each example, H1 corresponds to the third compound which is the host material, A1, A2, A3, and A4 correspond to the first compound which is the assist material, and G1, G2, G3, and G4 correspond to the second compound which is the guest material.

[0333]

[0334]

[0335] <Fabrication and evaluation of the luminescent layer thin film> Using vacuum deposition, a vacuum of 1 × 10⁻⁶ was used. －６ Under Pa conditions, compounds H1 and A1 were simultaneously deposited onto a quartz substrate from different deposition sources to form a luminescent layer thin film 1 with a thickness of 30 nm. At this time, the composition ratio (mass) of each compound was 80 (H1):20 (A1).

[0336] Separately from the luminescent layer thin film 1, compound H1 and compound G1 were simultaneously deposited from different deposition sources to form a 30 nm luminescent layer thin film 2. The composition ratio (mass) of the compounds at this time was 99 (H1):1 (G1).

[0337] The light-emitting layer thin film 1 was irradiated with 340 nm excitation light at room temperature (25°C, 298 K), and the emission (photoluminescence, PL) spectrum from compound A1 was obtained. １ (A), the emission peak wavelength Peak(A), and the full width at half maximum FWHM(A) were calculated. Furthermore, by irradiating compound A1 with the same excitation light at low temperatures (-196°C, 77K), the emission spectrum from compound A1 was obtained, and T １ (A) was calculated.

[0338] Furthermore, the light-emitting layer thin film 2 is irradiated with 340 nm excitation light at room temperature, and the emission spectrum from compound G1 is obtained, S １ (G), emission peak wavelength Peak(G), and full width at half maximum FWHM(G) were calculated. A Hitachi spectrophotometer F-4500 was used for the measurements.

[0339] <Solution Preparation and Evaluation> Compound G1, 10 －５A sample was prepared by placing M-toluene solution in a quartz cell (optical path width 10 mm). This sample was irradiated with light of wavelengths ranging from 200 to 800 nm, and the absorption (absorbance) of the light at each wavelength was obtained to measure the absorption spectrum. From this data, the energy E (λ) corresponding to the absorption peak wavelength located at the longest wavelength was calculated. ｍａｘ The molar extinction coefficient ε at this time was calculated. A Shimadzu Corporation "UV-3600" was used for the measurement.

[0340] (Example 1) A bottom-emission type organic light-emitting device was fabricated and evaluated as follows. The compounds used as the hole injection layer, hole transport layer 1, hole transport layer 2, electron blocking layer, and electron transport layer, excluding the light-emitting layer, are shown below.

[0341]

[0342] A first electrode made of ITO with a thickness of 50 nm is formed on a glass substrate, and each thin film is deposited by vacuum deposition to a thickness of 1 × 10 －６ The films were sequentially deposited under Pa vacuum. First, a hole injection layer was deposited on the ITO to a thickness of 10 nm. Next, a hole transport layer 1 was deposited to a thickness of 25 nm. Subsequently, a hole transport layer 2 was deposited to a thickness of 10 nm. Furthermore, compound H1 was deposited as an electron blocking layer to a thickness of 5 nm. Next, compound H1, compound A1, and compound G1 were simultaneously deposited from different deposition sources to form an emissive layer to a thickness of 30 nm. The composition ratio (mass) of each compound at this time was 79 (H1):20 (A1):1 (G1). Next, a hole blocking layer was deposited to a thickness of 10 nm. After that, an electron transport layer was deposited to a thickness of 30 nm. Furthermore, Liq was deposited as an electron injection layer to a thickness of 1 nm. Finally, an organic light-emitting element 1 (element 1) was fabricated by depositing Al as a second electrode to a thickness of 100 nm.

[0343] In addition to the above-mentioned element 1, the following organic light-emitting element 2 (element 2) was fabricated. In element 2, compound H1 and compound G1 were simultaneously deposited from different evaporation sources to form a light-emitting layer with a thickness of 30 nm. The composition ratio (mass) of the compounds at this time was 99 (H1):1 (G1). For the layers other than the light-emitting layer, the film thickness and materials were the same as those for element 1.

[0344] By applying voltage to element 1 and element 2 and illuminating them, the emission (electroluminescence, EL) spectra of each element were measured and compared. The emission spectrum for each element was 1000 cd / m². ２ Measurements were performed under a voltage that exhibited emission, and a Topcon SR-5A spectroradiometer was used to measure the spectrum.

[0345] (Example 2) Except for using compound A2 instead of compound A1, the thin film and solution were prepared in the same manner as in Example 1, and organic light-emitting devices 1 and 2 were fabricated and evaluated.

[0346] (Example 3) Thin films, solutions, and organic light-emitting elements 1 and 2 were prepared and evaluated in the same manner as in Example 1, except that compound A3 was used instead of compound A1 and compound G2 was used instead of compound G1.

[0347] (Example 4) Thin films, solutions, and organic light-emitting devices 1 and 2 were prepared and evaluated in the same manner as in Example 1, except that compound G4 was used instead of compound G1.

[0348] (Comparative Example 1) Thin films, solutions, and organic light-emitting elements 1 and 2 were prepared and evaluated in the same manner as in Example 1, except that compound A4 was used instead of compound A1.

[0349] (Comparative Example 2) Thin films, solutions, and organic light-emitting elements 1 and 2 were prepared and evaluated in the same manner as in Example 1, except that compound G3 was used instead of compound G1.

[0350] (Comparative Example 3) Thin films, solutions, and organic light-emitting elements 1 and 2 were prepared and evaluated in the same manner as in Example 1, except that compound A5 was used instead of compound A1 and compound G4 was used instead of compound G1.

[0351] (Comparative Example 4) Thin films, solutions, and organic light-emitting elements 1 and 2 were prepared and evaluated in the same manner as in Example 1, except that compound A6 was used instead of compound A1 and compound G4 was used instead of compound G1.

[0352] The evaluation of the thin films and solutions prepared in Examples 1 to 3 and Comparative Examples 1 to 2 yielded the following results: １ (A), T １ (A), S １ (G), Peak (A), FWHM (A), Peak (G), FWHM (G), E (λ ｍａｘ ), S １ (A) - E(λ) ｍａｘ ), ε, (S １ (A) - E(λ) ｍａｘ The list of )) × ε is shown in Tables 1 and 2 below.

[0353] Table 3 also shows the (S) of Examples 1 to 4 and Comparative Examples 1 to 4. １ (A) - E(λ) ｍａｘ We will show the multiplication by ε and the overlap integral J.

[0354] Furthermore, graphs comparing the emission spectra (PL) of the assist material obtained from thin film evaluation and the emission spectra (EL) obtained from the evaluation of organic light-emitting elements 1 and 2 are shown in Figure 8 for Example 1, Figure 9 for Example 2, Figure 10 for Example 3, Figure 11 for Comparative Example 1, and Figure 12 for Comparative Example 2. In Figures 8 to 12, the emission intensity of the emission peak with the highest emission intensity is shown as 1 for each emission spectrum.

[0355]

[0356]

[0357]

[0358] As is clear from Figures 8 to 10, in Examples 1 to 3 that satisfy formula [1], the emission spectrum of organic light-emitting element 1, which includes a host material, an assist material, and a guest material in its light-emitting layer, and the emission spectrum of organic light-emitting element 2, which includes a host material and a guest material, were generally equivalent. This is thought to be because the light emitted from the assist material was absorbed by the guest material, thereby reducing the proportion of light emitted from the assist material among the light emitted from the light-emitting layer.

[0359] On the other hand, as is clear from Figures 11 and 12, in Comparative Examples 1 and 2, the emission spectrum of the organic light-emitting element 1, which includes a host material, an assist material, and a guest material in its light-emitting layer, showed a shape with a broader peak than the emission spectrum of the organic light-emitting element 2, which includes a host material and a guest material.

[0360] Therefore, (S １ (A) - E(λ) ｍａｘ It was found that by satisfying )) × ε ≥ 8000, an organic light-emitting element with excellent color purity can be obtained. Also, J ≥ 3.0 × 10 １４ It was found that by satisfying these conditions, an organic light-emitting element with excellent color purity can be obtained.

[0361] The present invention is not limited to the embodiments described above, and various modifications and variations are possible without departing from the spirit and scope of the invention. Accordingly, the following claims are attached to make the scope of the invention public.

[0362] This application claims priority based on Japanese Patent Application No. 2025-003831, filed on January 10, 2025, and Japanese Patent Application No. 2025-260790, filed on December 17, 2025, and all of the contents of those applications are incorporated herein by reference.

[0363] 14, 32 Organic compound layer 18, 36 Organic light-emitting element 1000, 1300, 1310 Display device 1100 Imaging device 1104, 1203, 1313 Housing 1200 Electronic equipment 1201, 1302, 1311, 1312 Display unit 1707 Photoreceptor 1708 Exposure light source

Claims

An organic light-emitting element having a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, The organic compound layer has a light-emitting layer, and the light-emitting layer has a first compound and a second compound different from the first compound. The luminescence lifetime of the first compound is 500 [nsec] or more. The second compound is a fluorescent material, and is characterized by satisfying the following formula [1], in an organic light-emitting device. 80000≦(S) １ (A)-E(l) ｍａｘ ))×e [1] S １ (A) [eV]: Lowest singlet excitation energy of the first compound λ ｍａｘ [nm]: The longest wavelength absorption peak wavelength in the absorption spectrum of the second compound. E (λ ｍａｘ ) [eV]: λ ｍａｘ Energy equivalent to ε[M －１ ·cm －１ : Molar absorption coefficient of the second compound at λ ｍａｘ [nm] An organic light-emitting element having a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, The organic compound layer has a light-emitting layer, and the light-emitting layer has a first compound and a second compound different from the first compound. The first compound is a compound in which the difference between the lowest excited singlet energy and the lowest excited triplet energy is 0.25 [eV] or less. The second compound is a fluorescent material, and is characterized by satisfying the following formula [1], in an organic light-emitting device. 80000≦(S) １ (A)-E(l) ｍａｘ ))×e [1] S １ (A) [eV]: Lowest singlet excitation energy of the first compound λ ｍａｘ [nm]: The longest wavelength absorption peak wavelength in the absorption spectrum of the second compound. E (λ ｍａｘ ) [eV]: λ ｍａｘ Energy equivalent to ε[M －１ ・cm －１ ]: λ of the second compound ｍａｘ Molar extinction coefficient at [nm] An organic light-emitting element having a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, The organic compound layer has a light-emitting layer, and the light-emitting layer has a first compound and a second compound different from the first compound. The luminescence lifetime of the first compound is 500 [nsec] or more. The second compound is a fluorescent material, The value of the following formula [A] is 3.0 × 10 １４ The above-mentioned organic light-emitting device. [In equation [A], J is the value of the overlap integral, and f Ａ (λ) is the emission spectrum of the first compound, ε Ｇ (λ) is the molar extinction coefficient of the second compound, and λ is the wavelength. An organic light-emitting element having a first electrode, a second electrode, and an organic compound layer disposed between the first electrode and the second electrode, The organic compound layer has a light-emitting layer, and the light-emitting layer has a first compound and a second compound different from the first compound. The first compound is a compound in which the difference between the lowest excited singlet energy and the lowest excited triplet energy is 0.25 [eV] or less. The second compound is a fluorescent material, The value of the following formula [A] is 3.0 × 10 １４ The above-mentioned organic light-emitting device. [In equation [A], J is the value of the overlap integral, and f Ａ (λ) is the emission spectrum of the first compound, ε Ｇ (λ) is the molar extinction coefficient of the second compound, and λ is the wavelength. The value of the following formula [A] is 3.0 × 10 １４ The organic light-emitting element according to claim 1 or 2, characterized in that it is as described above. [In equation [A], J is the value of the overlap integral, and f Ａ (λ) is the emission spectrum of the first compound, ε Ｇ (λ) is the molar extinction coefficient of the second compound, and λ is the wavelength. 　 The organic light-emitting element according to claim 1 or 3, characterized in that the difference between the lowest excited singlet energy and the lowest excited triplet energy of the first compound is 0.25 [eV] or less. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that it satisfies the relationship in the following formula [2]. 80000≦(S) １ (A)-E(l) ｍａｘ ))×ε≦30 [2] The organic light-emitting element according to any one of claims 1 to 4, characterized in that it satisfies the relationship shown in the following formula [3]. 0.1[eV]≦S １ (A)-E(λ ｍａｘ ) [3] The organic light-emitting element according to any one of claims 1 to 4, characterized in that it satisfies the relationship shown in the following formula [4]. S １ (A)-E(λ ｍａｘ )≦0.40[eV] [4] The above ε is 20000 [M －１ ・cm －１ The organic light-emitting element according to any one of claims 1 to 4, characterized in that it is more than or equal to the above. 　 The above ε is 250,000 [M －１ ・cm －１ The organic light-emitting element according to any one of claims 1 to 4, characterized in that it is as follows: 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the wavelength of the emission peak showing the highest emission intensity among the emission peaks of the first compound is longer than the wavelength of the emission peak showing the highest emission intensity among the emission peaks of the second compound. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the full width at half maximum of the emission peak showing the highest emission intensity among the emission peaks of the first compound is 90 nm or less. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the wavelength of the emission peak showing the highest emission intensity among the emission peaks of the second compound is 440 nm or more and 480 nm or less. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the full width at half maximum of the emission peak showing the highest emission intensity among the emission peaks of the second compound is 30 nm or less. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the first compound is a compound represented by the following general formula (1). [In general formula (1), R １１ ~R １８ Each substituent is independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. Each substituent may be the same or different, and adjacent substituents may bond to each other to form a ring. 　 n is an integer between 1 and 5, and m is an integer between 1 and 3. 　 EWG represents an electron-withdrawing substituent. R ２１ Each of these is independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. l is an integer between 0 and 4. Multiple R ２１ They may be the same or different. The organic light-emitting element according to claim 16, characterized in that the first compound relating to the general formula (1) is a compound represented by the following general formula (1a). [In general formula (1a), R １１ ~R １８ Each substituent is independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. Each substituent may be the same or different, and adjacent substituents may bond to each other to form a ring. R ２１ , R ３１ and R ３２ Each of these is independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. l is an integer between 0 and 4, m is an integer between 1 and 2, and n is an integer between 1 and 5. Multiple R ２１ They may be the same or different. The organic light-emitting element according to claim 16, characterized in that the first compound relating to the general formula (1) is a compound represented by either of the following general formulas (1b-1) or (1b-2). [In general formulas (1b-1) and (1b-2), R １１ ~R １３ Each substituent is independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. Each substituent may be the same or different, and adjacent substituents may bond to each other to form a ring. R ２１ , R ３１ and R ３２ Each of these is independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. n is an integer between 0 and 2, and n' and n'' are integers between 0 and 4. l is an integer between 1 and 4, and m and m' are integers between 0 and 5. 　 The substituents mentioned above may be the same or different from each other. X is an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom, NR, or CRR'. R and R' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups. 　 The organic light-emitting element according to claim 16, characterized in that the first compound relating to the general formula (1) is a compound represented by the following general formula (1c). [In general formula (1c), R １１ ~R １８ Each substituent is independently selected from a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. Each substituent may be the same or different, and adjacent substituents may bond to each other to form a ring. R ２１ Each of these is independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group. l is an integer from 0 to 4, m is an integer from 1 to 3, and n is an integer from 1 to 5. Multiple R ２１ They may be the same or different. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the first compound is a compound represented by any one of the following general formulas (2) or (3). [In general formulas (2) and (3), M １ and M ２ This represents a transition metal. X １１ ~X １４ , X ２１ , X ２２ This is independently selected from either a nitrogen atom or a carbon atom. Cy １ ~Cy ５ This refers to a ring structure having 5 to 20 carbon atoms, consisting of carbon atoms and hydrogen atoms, or a heterocyclic structure having 2 to 19 carbon atoms, including heteroatoms. R １１ ~R １４ , R ３１ Each of these represents a substituent on an atom forming a ring, and is independently selected from the group consisting of deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups, and adjacent substituents may bond to each other to form a ring. 　 l and n are integers from 0 to 12, m and o are integers from 0 to 11, and o' is an integer from 0 to 12. In general formula (2), L １１ ~L １３ These are single bonds, double bonds, oxygen atoms, sulfur atoms, selenium atoms, tellurium atoms, *-CR=*, *-CO-*, *-CRR'-*, *-CR=C-*, *=CR-*, *-C≡C-*, *-NR-*, *-BR-*, *-CS-*, *-PR-*, *-SO-*, *-SO ２ Each is independently selected from the groups consisting of -* and *-SiRR'-*. * is Cy １ and Cy ２ Cy ２ and Cy ４ Cy ３ and Cy ４ This represents the bond position to each Cy ring in the given structure. R and R' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups. 　 In general formula (3), L ２１ , L ２２ These represent different ligands. 　 m' and n' are integers from 0 to 2, and l' is an integer from 1 to 3, such that m' + n' + l' = 2 or 3. R ２１ ~R ２４ Each of these substituents may be independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted silyl group, and a cyano group, and adjacent substituents may be bonded to each other to form a ring. M ２ (L ２１ )n' is given by the following general formula (3-1) or (3-2), M ２ (L ２２ )m' is represented by the following general formula (3-3), and each is chosen independently. In general formulas (3-1) to (3-3), R ４１ ~R ４４ , R ５１ ~R ５３ Each of these is independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted silyl group, and a cyano group. Cy ６ This is a ring structure with 5 to 10 carbon atoms, or a heterocyclic structure with 4 to 9 carbon atoms containing a heteroatom. R ４５ represents a substituent for the atom forming Cy ６ and is independently selected from the group consisting of a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted silyl group, and a cyano group. p' is an integer between 0 and 6. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the second compound is a compound represented by the following general formula (4). [In general formula (4), Cy １ ~Cy ３ This is a ring structure with 5 to 13 carbon atoms, or a heterocyclic structure with 4 to 12 carbon atoms containing a heteroatom. R １１ and R １２ , R １４ each represents a substituent on a carbon atom or heteroatom of Cy １ to Cy ３ and is independently selected from a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a cyano group, and a silyl group, respectively. 　 l and m are integers from 0 to 8, and n is an integer from 0 to 7. X is a boron atom or a nitrogen atom, and Y and Z are an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom, BR, and NR. Here, R is independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups. At least one of X, Y, and Z is a boron atom or BR. R １１ and R １２ , R １１ and R, R １２ and R, R １４ R and R may form a ring with each other. If a ring is formed, it may contain carbon atoms or heteroatoms. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the second compound is represented by either of the following general formulas (4a-1) or (4a-2). [In general formulas (4a-1) and (4a-2), Cy １ ~Cy ５ This is a ring structure with 5 to 13 carbon atoms, or a heterocyclic structure with 4 to 12 carbon atoms containing a heteroatom. R １１ ~R １５ These are Cy １ ~Cy ５ The substituents on the carbon atom or heteroatom are independently selected from the group consisting of deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups, and adjacent substituents may be bonded to each other to form a ring. In general formula (4a-1), l, l', m, and m' are between 0 and 8, and n is an integer between 0 and 2. In general formula (4a-2), l and l' are between 0 and 8, and m, m', and n are integers between 0 and 6. R in general formula (4a-1) １１ and R １２ , R １２ and R １３ , R １５ and R １１ The substituents may bond to each other to form a ring, and in general formula (4a-2), R １１ and R １４ , R １２ and R １４ The substituents may bond to each other to form a ring. If a ring is formed, it may contain carbon atoms or heteroatoms. X is a nitrogen atom. X １ and X ２ , Y １ and Y ２ The atoms are an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom, NR, and SiRR''. Here, R and R'' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups. X １ and X ２ , Y １ and Y ２ They may be the same as, or very different from, each other. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the second compound is represented by the following general formula (4a-3). [In general formula (4a-3), R １１ ~R １４ , R ２１ and R ２４ , R ３１ Each of these substituents may be independently selected from the group consisting of hydrogen atoms, deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups, and adjacent substituents may bond to each other to form a ring. When a ring is formed, carbon atoms or heteroatoms may be included. Y １ and Y ２ Here, R and R' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups. １ and Y ２ They may be the same as, or they may be different from, each other. Cy １ and Cy ２ This is represented by the following general formula (4a-3') or general formula (4a-3''). In general formulas (4a-3') and (4a-3''), * represents the bonding position with * in the general formula (4a-3), and represents the boron atom and Y, respectively. １ and Y ２ It combines with it to form a ring. X １ and X ２ R and R'' are independently selected from the group of chalcogen atoms consisting of oxygen, sulfur, selenium, tellurium, NR, SiRR'', and CR''. R and R'' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heteroaryl groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups. R ４１ ~R ４４ , R ５１ and R ５４ Each of these substituents may be independently selected from the group consisting of hydrogen atoms, deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups, and adjacent substituents may be bonded to each other to form a ring. When a ring is formed, carbon atoms or heteroatoms may be included. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the second compound is represented by either of the following general formulas (5-1) or (5-2). [In general formulas (5-1) and (5-2), Cy ４ This is a ring structure with 5 to 13 carbon atoms or a heterocyclic structure with 4 to 12 carbon atoms containing a heteroatom. R １１ ~R ２７ Each of these substituents may be independently selected from the group consisting of hydrogen atoms, deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups, and adjacent substituents may bond to each other to form a ring. When a ring is formed, carbon atoms or heteroatoms may be included. X' and Y' are an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom, NR, SiRR', or CRR'. Here, R and R' are independently selected from the group consisting of substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, and substituted or unsubstituted silyl groups. R ３１ is Cy ４ The substituents are independently selected from the group consisting of a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted silyl group, and a cyano group. n is an integer between 0 and 6. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the light-emitting layer has a third compound, and the lowest singlet excitation energy of the third compound is higher than the lowest singlet excitation energy of the first compound. 　 The organic light-emitting element according to claim 22, characterized in that the third compound is a compound represented by the following general formula (6). [In general formula (6), R １１ ~R １８ Each of these substituents may be independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, a substituted or unsubstituted silyl group, and a cyano group, and adjacent substituents may be bonded to each other to form a ring. Cy Ａ This is a ring structure with 6 to 13 carbon atoms, or a heterocyclic structure with 5 to 12 carbon atoms containing a heteroatom. n is an integer between 1 and 5. R ａ Cy Ａ The substituents on the ring-forming atoms are independently selected from the group consisting of deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups. 　 n' is an integer between 1 and 9. R １１ ~R １８ , and R ａ At least one of them has the structure of the following general formulas (6a) to (6d). In general formulas (6a) to (6d), X １ ~X ３ , Y １ Y ４ These are carbon atoms or nitrogen atoms, which may be the same or different from each other. Z １ It is one of the following atoms: nitrogen, oxygen, sulfur, selenium, or tellurium. R ２１ ~R ２５ , R ３１ ~R ３６ , R ４１ and R ４２ , R ５１ ~R ５３ The substituents represent atoms forming each ring structure and are independently selected from the group consisting of deuterium atoms, halogen atoms, substituted or unsubstituted alkyl groups, substituted or unsubstituted aryl groups, substituted or unsubstituted heterocyclic groups, substituted or unsubstituted amino groups, substituted or unsubstituted alkoxy groups, substituted or unsubstituted aryloxy groups, substituted or unsubstituted heteroaryloxy groups, substituted or unsubstituted silyl groups, and cyano groups, and adjacent substituents may bond to each other to form a ring. 　 m and m' are integers from 0 to 4, and l, l', and l'' are integers from 0 to 5. Z １ If R is a nitrogen atom, ４３ Z is one of the groups consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted amino group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted heteroaryloxy group, or a substituted or unsubstituted silyl group. １ If R is not a nitrogen atom, ４３ It is a hydrogen atom. * represents R in general formula (6). １１ ~R １８ and R ａ The bond position in is represented, and the general formulas (6a) to (6d) are determined by the bond position of *. Ａ It may be directly bonded to the ring. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the mass ratio of the first compound in the light-emitting layer is greater than the mass ratio of the second compound. 　 The organic light-emitting element according to any one of claims 1 to 4, characterized in that the content of the second compound in the light-emitting layer is 0.5% by mass or more. 　 A display device having a plurality of pixels, wherein at least one of the plurality of pixels is an organic light-emitting element according to any one of claims 1 to 4 and a transistor connected to the organic light-emitting element. 　 It comprises an optical unit having multiple lenses, an image sensor that receives light that has passed through the optical unit, and a display unit that displays the image captured by the image sensor. The photoelectric conversion device is characterized in that the display unit has an organic light-emitting element as described in any one of claims 1 to 4. 　 An electronic device comprising: a display unit having an organic light-emitting element as described in any one of claims 1 to 4; a housing on which the display unit is provided; and a communication unit provided in the housing for communicating with the outside. 　 A lighting device comprising a light source having an organic light-emitting element as described in any one of claims 1 to 4, and a light-diffusing portion or optical film that transmits light emitted by the light source. 　 A mobile body characterized by comprising a lamp having an organic light-emitting element as described in any one of claims 1 to 4, and a body on which the lamp is provided.

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